[1] : The Collaborative International Dictionary of English v.0.48

weak \weak\ w=ek, a. compar. weaker w=ek"~er;
   superl. weakest. oe. weik, icel. veikr; akin to sw. vek,
   dan. veg soft, flexible, pliant, as. w=ac weak, soft,
   pliant, d. week, g. weich, ohg. weih; all from the verb seen
   in icel. vimackja to turn, veer, recede, as. wimaccan to
   yield, give way, g. weichen, ohg. wimachhan, akin to skr.
   vij, and probably to e. week, l. vicis a change, turn, gr.
   e'i`kein to yield, give way. root132. cf. week, wink,
   v. i. vicissitude.
   1913 webster
   1. wanting physical strength. specifically: 
      1913 webster
      a deficient in strength of body; feeble; infirm; sickly;
          debilitated; enfeebled; exhausted.
          1913 webster

                a poor, infirm, weak, and despised old man.
                                                  --shak.
          1913 webster

                weak with hunger, mad with love.  --dryden.
          1913 webster
      b not able to sustain a great weight, pressure, or
          strain; as, a weak timber; a weak rope.
          1913 webster
      c not firmly united or adhesive; easily broken or
          separated into pieces; not compact; as, a weak ship.
          1913 webster
      d not stiff; pliant; frail; soft; as, the weak stalk of
          a plant.
          1913 webster
      e not able to resist external force or onset; easily
          subdued or overcome; as, a weak barrier; as, a weak
          fortress.
          1913 webster
      f lacking force of utterance or sound; not sonorous;
          low; small; feeble; faint.
          1913 webster

                a voice not soft, weak, piping, and womanish.
                                                  --ascham.
          1913 webster
      g not thoroughly or abundantly impregnated with the
          usual or required ingredients, or with stimulating and
          nourishing substances; of less than the usual
          strength; as, weak tea, broth, or liquor; a weak
          decoction or solution; a weak dose of medicine.
          1913 webster
      h lacking ability for an appropriate function or office;
          as, weak eyes; a weak stomach; a weak magistrate; a
          weak regiment, or army.
          1913 webster

   2. not possessing or manifesting intellectual, logical,
      moral, or political strength, vigor, etc. specifically: 
      1913 webster
      a feeble of mind; wanting discernment; lacking vigor;
          spiritless; as, a weak king or magistrate.
          1913 webster

                to think every thing disputable is a proof of a
                weak mind and captious temper.    --beattie.
          1913 webster

                origen was never weak enough to imagine that
                there were two gods.              --waterland.
          1913 webster
      b resulting from, or indicating, lack of judgment,
          discernment, or firmness; unwise; hence, foolish.
          1913 webster

                if evil thence ensue,
                she first his weak indulgence will accuse.
                                                  --milton.
          1913 webster
      c not having full confidence or conviction; not decided
          or confirmed; vacillating; wavering.
          1913 webster

                him that is weak in the faith receive ye, but
                not to doubtful disputations.     --rom. xiv. 1.
          1913 webster
      d not able to withstand temptation, urgency, persuasion,
          etc.; easily impressed, moved, or overcome;
          accessible; vulnerable; as, weak resolutions; weak
          virtue.
          1913 webster

                guard thy heart
                on this weak side, where most our nature fails.
                                                  --addison.
          1913 webster
      e wanting in power to influence or bind; as, weak ties;
          a weak sense of honor of duty.
          1913 webster
      f not having power to convince; not supported by force
          of reason or truth; unsustained; as, a weak argument
          or case. "convinced of his weak arguing." --milton.
          1913 webster

                a case so weak . . . hath much persisted in.
                                                  --hooker.
          1913 webster
      g wanting in point or vigor of expression; as, a weak
          sentence; a weak style.
          1913 webster
      h not prevalent or effective, or not felt to be
          prevalent; not potent; feeble. "weak prayers." --shak.
          1913 webster
      i lacking in elements of political strength; not
          wielding or having authority or energy; deficient in
          the resources that are essential to a ruler or nation;
          as, a weak monarch; a weak government or state.
          1913 webster

                i must make fair weather yet awhile,
                till henry be more weak, and i more strong.
                                                  --shak.
          1913 webster
      k stock exchange tending towards lower prices; as, a
          weak market.
          1913 webster

   3. gram.
      a pertaining to, or designating, a verb which forms its
          preterit imperfect and past participle by adding to
          the present the suffix -ed, -d, or the variant form
          -t; as in the verbs abash, abashed; abate, abated;
          deny, denied; feel, felt. see strong, 19
      a .
      b pertaining to, or designating, a noun in anglo-saxon,
          etc., the stem of which ends in -n. see strong, 19
      b .
          1913 webster

   4. stock exchange tending toward a lower price or lower
      prices; as, wheat is weak; a weak market.
      webster 1913 suppl.

   5. card playing lacking in good cards; deficient as to
      number or strength; as, a hand weak in trumps.
      webster 1913 suppl.

   6. photog. lacking contrast; as, a weak negative.
      webster 1913 suppl.

   note: weak is often used in the formation of self-explaining
         compounds; as, weak-eyed, weak-handed, weak-hearted,
         weak-minded, weak-spirited, and the like.
         1913 webster
         1913 webster

   weak conjugation gram., the conjugation of weak verbs; --
      called also new conjugation, or regular conjugation,
      and distinguished from the old conjugation, or
      irregular conjugation.

   weak declension anglo-saxon gram., the declension of weak
      nouns; also, one of the declensions of adjectives.

   weak side, the side or aspect of a person's character or
      disposition by which he is most easily affected or
      influenced; weakness; infirmity.

   weak sore or weak ulcer med., a sore covered with pale,
      flabby, sluggish granulations.
      1913 webster
see also:
weaker weakest week wink vicissitude strong 
weak conjugation new conjugation regular conjugation old conjugation irregular conjugation 
weak declension weak side weak sore weak ulcer 

[2] : The Collaborative International Dictionary of English v.0.48

weak \weak\, v. t.  i. cf. as. w?can. w=acian. see weak,
   a.
   to make or become weak; to weaken. r.
   1913 webster

         never to seek weaking variety.           --marston.
   1913 webster
see also:
weak 

[3] : WordNet (r) 2.0

weak
     adj 1: having little physical or spiritual strength; "a weak radio
            signal"; "a weak link" ant: strong
     2: overly diluted; thin and insipid; "washy coffee"; "watery
        milk"; "weak tea" syn: watery, washy
     3: lacking power syn: powerless ant: powerful
     4: used of vowels or syllables; pronounced with little or no
        stress; "a syllable that ends in a short vowel is a light
        syllable"; "a weak stress on the second syllable" syn: unaccented,
         light
     5: having the attributes of man as opposed to e.g. divine
        beings; "i'm only human"; "frail humanity" syn: fallible,
         frail, imperfect
     6: lacking force; feeble; "a forceless argument" syn: forceless,
         unforceful ant: forceful
     7: lacking physical strength or vitality; "a feeble old woman";
        "her body looked sapless" syn: decrepit, debile, feeble,
         infirm, sapless, weakly
     8: used of verbs having standard or regular inflection
     9: lacking physical strength or vigor
     10: characterized by excessive softness or self-indulgence; "an
         effeminate civilization" syn: effeminate
see also:
strong watery washy powerless powerful unaccented 
light fallible frail imperfect forceless 
unforceful forceful decrepit debile feeble 
infirm sapless weakly effeminate 

[4] : Moby Thesaurus II by Grady Ward, 1.0

523 moby thesaurus words for "weak":
   adamic, adamite, adamitic, abulic, accented, accessible,
   achromatic, achromic, afraid, airy, alveolar, amenable, anemic,
   anile, anthropocentric, anthropological, apical, apico-alveolar,
   apico-dental, articulated, ashen, ashy, assailable, assimilated,
   asthenic, attackable, attenuate, attenuated, back, backsliding,
   barely audible, barytone, beatable, bilabial, blear, bleared,
   bleary, bled white, bloodless, blurred, blurry, boyish, broad,
   bungling, cacuminal, cadaverous, careless, carnal, central,
   cerebral, checked, chicken, chickenhearted, chloranemic, close,
   colorless, confused, conquerable, consonant, consonantal,
   continuant, coward, cowardly, cowed, crabbed, dark, daunted, dead,
   deadly pale, deathly pale, debilitated, decrepit, decrescendo,
   delicate, dental, diaphanous, dickey, dilute, diluted, dim, dimmed,
   dingy, discolored, dismayed, dissimilated, distant, doddered,
   doddering, doddery, dorsal, drooping, droopy, dull, earthy, easy,
   easygoing, effete, emasculate, enervated, enfeebled, erring,
   ethereal, etiolated, expugnable, exsanguinated, exsanguine,
   exsanguineous, fade, faded, fagged, faint, faint-voiced,
   fainthearted, fainting, faintish, fallen, fallow, fatigued,
   fearful, featherweight, feeble, feebleminded, feeling faint, filmy,
   fine, fine-drawn, finespun, finite, flabby, flaccid, flagging,
   flat, flavorless, fleshly, flimsy, floppy, fluctuant, foggy,
   footsore, forceless, fossilized, fragile, frail, frazzled, front,
   funking, funky, fuzzy, gauzy, gentle, gerontal, gerontic, ghastly,
   girlish, glide, glossal, glottal, gone, good and tired, gossamer,
   gracile, gray, gruelly, gutless, guttural, haggard, half-heard,
   half-seen, half-visible, hard, hazy, heavy, henhearted, hesitant,
   high, hominal, homocentric, hueless, human, humanistic,
   hypochromic, ill-defined, imbecile, impotent, imprecise,
   impressionable, improbable, impure, inadequate, inane, incompetent,
   inconceivable, inconclusive, inconspicuous, incredible, indefinite,
   indifferent, indistinct, indistinguishable, ineffective,
   ineffectual, inefficacious, inept, infirm, influenceable, insecure,
   insipid, insubstantial, intimidated, intonated, invertebrate,
   irresolute, jaded, jejune, labial, labiodental, labiovelar,
   lackluster, lacy, languid, languorous, lapsed, lax, leaden,
   lenient, light, lightweight, lily-livered, limber, limp, lingual,
   liquid, listless, livid, loose, low, low-profile, lurid,
   lusterless, lustless, malleable, man-centered, marrowless, mat,
   mealy, merely glimpsed, mid, mild, milk-and-water, milk-livered,
   milksoppish, milksoppy, misty, monophthongal, mortal, mossbacked,
   moth-eaten, mousy, movable, muddy, mummylike, murmured, muted,
   narrow, nasal, nasalized, negligent, nerveless, neutral,
   no-account, obscure, occlusive, of easy virtue, of no account,
   only human, open, open-minded, out of focus, overindulgent,
   overpermissive, overtimid, overtimorous, oxytone, palatal,
   palatalized, pale, pale as death, pale-faced, pallid, palsied,
   panic-prone, panicky, papery, papery-skinned, pappy, pasty,
   peccable, penetrable, permissive, persuadable, persuasible,
   pervious, pharyngeal, pharyngealized, phonemic, phonetic, phonic,
   pianissimo, piano, pigeonhearted, pitch, pitched, pithless,
   plastic, pliable, pliant, pooped, poor, postlapsarian, posttonic,
   powerless, pregnable, prodigal, pulpy, puny, rabbity, rare,
   rarefied, ravaged with age, ready to drop, receptive, recidivist,
   recidivistic, relaxed, remiss, responsive, retroflex, rickety,
   rootless, rounded, rubbery, run ragged, run to seed, run-down,
   rusty, sagging, sallow, sapless, savorless, scarcely heard, seedy,
   semivisible, semivowel, senile, shadowy, shaky, shriveled, sickly,
   sinewless, sissified, sissy, slack, slender, slenderish, slight,
   slight-made, slim, slimmish, slinky, slipshod, sloppy, small, soft,
   soft-sounding, soft-voiced, sonant, spiceless, spindly, spineless,
   stale, stopped, strengthless, stressed, stricken in years, strong,
   suasible, subaudible, subdued, subtle, suggestible, surd,
   surmountable, susceptible, svelte, swayable, syllabic, sylphlike,
   tallow-faced, tasteless, tellurian, tense, tenuous, thick, thin,
   thin-bodied, thin-set, thin-spun, thinnish, threadlike, throaty,
   timeworn, timid, timorous, tired, tired-winged, toilworn, tonal,
   toneless, tonic, tottering, tottery, trimming, twangy, unaccented,
   unangelic, unauthoritative, unbelievable, uncertain, unchaste,
   unclean, unclear, uncolored, unconvincing, undefined, undependable,
   unfit, unflavored, ungodly, ungood, unhardened, unmanly, unmanned,
   unnerved, unplain, unproved, unqualified, unrecognizable,
   unrefreshed, unreliable, unrestored, unrestrained, unrighteous,
   unrigorous, unrounded, unsaintly, unsavory, unsound, unstable,
   unstressed, unstrung, unsubstantial, unsuitable, unsure,
   unsustained, unvirtuous, vacillating, vague, vapid, velar,
   vincible, virtueless, vocalic, vocoid, voiced, voiceless, vowel,
   vowellike, vulnerable, wan, wanton, washed-out, washy,
   wasp-waisted, watered, watered-down, waterish, watery, wavering,
   waxen, way-weary, wayward, wayworn, weak-kneed, weak-minded,
   weak-voiced, weak-willed, weakened, weakhearted, weakly, wearied,
   weariful, weary, weary-footed, weary-laden, weary-winged,
   weary-worn, whey-faced, whispered, white, white-livered, wide,
   willowy, wilting, wiredrawn, wishy-washy, wispy, withered,
   without any weight, wizened, wobbly, worn, worn-down, yellow

Weak >> W Words
Weak, definition of term: Weak
weak_pag1.html

Weak Force >> W Words
Weak Force, definition of term: Weak Force
weak+force_pag1.html

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