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

dark \dark\ daumrk, a. oe. dark, derk, deork, as. dearc,
   deorc; cf. gael.  ir. dorch, dorcha, dark, black, dusky.
   1. destitute, or partially destitute, of light; not
      receiving, reflecting, or radiating light; wholly or
      partially black, or of some deep shade of color; not
      light-colored; as, a dark room; a dark day; dark cloth;
      dark paint; a dark complexion.
      1913 webster

            o dark, dark, dark, amid the blaze of noon,
            irrecoverably dark, total eclipse
            without all hope of day              --milton.
      1913 webster

            in the dark and silent grave.         --sir w.
                                                  raleigh.
      1913 webster

   2. not clear to the understanding; not easily seen through;
      obscure; mysterious; hidden.
      1913 webster

            the dark problems of existence.       --shairp.
      1913 webster

            what may seem dark at the first, will afterward be
            found more plain.                     --hooker.
      1913 webster

            what's your dark meaning, mouse, of this light word?
                                                  --shak.
      1913 webster

   3. destitute of knowledge and culture; in moral or
      intellectual darkness; unrefined; ignorant.
      1913 webster

            the age wherein he lived was dark, but he
            could not want light who taught the world to see.
                                                  --denhan.
      1913 webster

            the tenth century used to be reckoned by mediaeval
            historians as the darkest part of this intellectual
            night.                                --hallam.
      1913 webster

   4. evincing black or foul traits of character; vile; wicked;
      atrocious; as, a dark villain; a dark deed.
      1913 webster

            left him at large to his own dark designs. --milton.
      1913 webster

   5. foreboding evil; gloomy; jealous; suspicious.
      1913 webster

            more dark and dark our woes.          --shak.
      1913 webster

            a deep melancholy took possesion of him, and gave a
            dark tinge to all his views of human nature.
                                                  --macaulay.
      1913 webster

            there is, in every true woman-s heart, a spark of
            heavenly fire, which beams and blazes in the dark
            hour of adversity.                    --w. irving.
      1913 webster

   6. deprived of sight; blind. obs.
      1913 webster

            he was, i think, at this time quite dark, and so had
            been for some years.                  --evelyn.
      1913 webster

   note: dark is sometimes used to qualify another adjective;
         as, dark blue, dark green, and sometimes it forms the
         first part of a compound; as, dark-haired, dark-eyed,
         dark-colored, dark-seated, dark-working.
         1913 webster

   a dark horse, in racing or politics, a horse or a candidate
      whose chances of success are not known, and whose
      capabilities have not been made the subject of general
      comment or of wagers. colloq.

   dark house, dark room, a house or room in which madmen
      were confined. obs. --shak.

   dark lantern. see lantern. -- the

   dark ages, a period of stagnation and obscurity in
      literature and art, lasting, according to hallam, nearly
      1000 years, from about 500 to about 1500 a. d.. see
      middle ages, under middle.

   the dark and bloody ground, a phrase applied to the state
      of kentucky, and said to be the significance of its name,
      in allusion to the frequent wars that were waged there
      between indians.

   the dark day, a day may 19, 1780 when a remarkable and
      unexplained darkness extended over all new england.

   to keep dark, to reveal nothing. low
      1913 webster
see also:
a dark horse dark house dark room dark lantern lantern dark ages 
middle ages middle the dark and bloody ground the dark day to keep dark 

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

dark \dark\ daumrk, n.
   1. absence of light; darkness; obscurity; a place where there
      is little or no light.
      1913 webster

            here stood he in the dark, his sharp sword out.
                                                  --shak.
      1913 webster

   2. the condition of ignorance; gloom; secrecy.
      1913 webster

            look, what you do, you do it still i' th' dark.
                                                  --shak.
      1913 webster

            till we perceive by our own understandings, we are
            as much in the dark, and as void of knowledge, as
            before.                               --locke.
      1913 webster

   3. fine arts a dark shade or dark passage in a painting,
      engraving, or the like; as, the light and darks are well
      contrasted.
      1913 webster

            the lights may serve for a repose to the darks, and
            the darks to the lights.              --dryden.
      1913 webster

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

dark \dark\, v. t.
   to darken; to obscure. obs. --milton.
   1913 webster

[4] : WordNet (r) 2.0

dark
     adj 1: devoid or partially devoid of light or brightness; shadowed
            or black or somber-colored; "sitting in a dark
            corner"; "a dark day"; "dark shadows"; "the theater is
            dark on mondays"; "dark as the inside of a black cat"
            ant: light
     2: used of color having a dark hue; "dark green"; "dark
        glasses"; "dark colors like wine red or navy blue" ant: light
     3: brunet used of hair or skin or eyes; "dark eyes"
     4: stemming from evil characteristics or forces; wicked or
        dishonorable; "black deeds"; "a black lie"; "his black
        heart has concocted yet another black deed"; "darth vader
        of the dark side"; "a dark purpose"; "dark undercurrents
        of ethnic hostility"; "the scheme of some sinister
        intelligence bent on punishing him"-thomas hardy syn: black,
         sinister
     5: causing dejection; "a blue day"; "the dark days of the war";
        "a week of rainy depressing weather"; "a disconsolate
        winter landscape"; "the first dismal dispiriting days of
        november"; "a dark gloomy day"; "grim rainy weather" syn:
         blue, depressing, disconsolate, dismal, dispiriting,
         gloomy, grim
     6: secret; "keep it dark"; "the dark mysteries of africa and
        the fabled wonders of the east"
     7: showing a brooding ill humor; "a dark scowl"; "the
        proverbially dour new england puritan"; "a glum, hopeless
        shrug"; "he sat in moody silence"; "a morose and
        unsociable manner"; "a saturnine, almost misanthropic
        young genius"- bruce bliven; "a sour temper"; "a sullen
        crowd" syn: dour, glowering, glum, moody, morose,
         saturnine, sour, sullen
     8: lacking enlightenment or knowledge or culture; "this
        benighted country"; "benighted ages of barbarism and
        superstition"; "the dark ages"; "a dark age in the history
        of education" syn: benighted
     9: marked by difficulty of style or expression; "much that was
        dark is now quite clear to me"; "those who do not
        appreciate kafka's work say his style is obscure" syn: obscure
     10: having skin rich in melanin pigments; "national association
         for the advancement of colored people"; "the dark races";
         "dark-skinned peoples" syn: colored, coloured, dark-skinned
     11: not giving performances; closed; "the theater is dark on
         mondays"
     n 1: absence of light or illumination syn: darkness ant: light
     2: absence of moral or spiritual values; "the powers of
        darkness" syn: iniquity, wickedness, darkness
     3: an unilluminated area; "he moved off into the darkness"
        syn: darkness, shadow
     4: the time after sunset and before sunrise while it is dark
        outside syn: night, nighttime ant: day
     5: an unenlightened state; "he was in the dark concerning their
        intentions"; "his lectures dispelled the darkness" syn: darkness
see also:
light black sinister blue depressing disconsolate 
dismal dispiriting gloomy grim dour 
glowering glum moody morose saturnine 
sour sullen benighted obscure colored 
coloured dark-skinned darkness iniquity wickedness 
shadow night nighttime day 

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

454 moby thesaurus words for "dark":
   egyptian darkness, erebus, gothicism, stygian, ableptical,
   abominable, abstruse, adiaphanous, age of ignorance, amaurotic,
   amoral, amorphous, amorphousness, apocalyptic, arcane, arrant,
   atramentous, atrocious, bad, baleful, baneful, barbarism, base,
   beamless, beetle-browed, benighted, benightedness, benightment,
   bereft of light, black, black as coal, black as ebony,
   black as ink, black as midnight, black as night, black-browed,
   black-skinned, blackish, blackness, blamable, blameworthy, bleak,
   blear, bleared, bleary, blind, blurred, blurry, bodeful, boding,
   brown, brunet, cabalistic, caliginous, castellatus, censored,
   cheerless, cirrose, cirrous, classified, clear as mud, close,
   closed, closemouthed, cloud-flecked, clouded, cloudy, coal-black,
   coaly, color-blind, colored, complicated, concealed, confused,
   conscienceless, corrupt, corrupted, criminal, crooked, cryptic,
   cumuliform, cumulous, damnable, dark age, dark as night,
   dark as pitch, dark-colored, dark-complexioned, dark-skinned,
   darkish, darkling, darkness, darkness visible, darksome,
   dead of night, deep, deep black, dejected, devilish, devious, dim,
   dim-sighted, dire, dirty, discreet, disgraceful, dishonest,
   dishonorable, dismal, doleful, doomful, doubtful, dour, drab,
   drear, drearisome, dreary, dubious, dull, dumpish, dun, dusk,
   dusky, ebon, ebony, eclipsed, enigmatic, esoteric, evasive, evil,
   evil-starred, execrable, eyeless, faint, fateful, feeble,
   felonious, filmy, fishy, flagitious, flagrant, fog, fogginess,
   foggy, foreboding, foul, fraudulent, frowning, funebrial, funereal,
   fuzziness, fuzzy, gloom, gloominess, gloomy, glowering, glum,
   grave, gray, grim, grum, grumly, half-seen, half-visible, hazy,
   heathenism, heavy, heinous, hellish, hemeralopic, hermetic, hidden,
   hush-hush, ignorance, ignorant, ill, ill-boding, ill-defined,
   ill-fated, ill-got, ill-gotten, ill-lighted, ill-lit, ill-omened,
   ill-starred, immoral, impenetrable, impervious to light, improper,
   in darkness, in the dark, inauspicious, incomprehensible,
   inconspicuous, indefinite, indeterminate, indeterminateness,
   indirect, indistinct, indistinctness, indistinguishable, infamous,
   iniquitous, ink-black, inky, insidious, intense darkness,
   intransparent, intricate, jetty, joyless, knavish, knotty, latent,
   lenticularis, lightlessness, low, low-profile, lowering, mammatus,
   melancholy, melanian, melanic, melanistic, melano, melanotic,
   melanous, menacing, merely glimpsed, midnight, mind-blind, mist,
   mistiness, misty, monstrous, moodish, moody, moonlessness, mopey,
   moping, mopish, morose, mournful, muddy, mumbo jumbo, mumpish,
   murk, murkiness, murky, mysterious, mystic, mystical,
   mystification, mystifying, naughty, nebulous, nefarious, night,
   night-black, night-clad, night-cloaked, night-dark,
   night-enshrouded, night-filled, night-mantled, night-veiled,
   nightfall, nigrescent, nigrous, nimbose, not kosher, nubilous,
   nyctalopic, obfuscated, obfuscation, obscurantism, obscuration,
   obscure, obscure darkness, obscured, obscurity, occult, occulted,
   of evil portent, ominous, opacity, opaque, out of focus, overcast,
   overclouded, paganism, pale, peccant, perplexity, pessimistic,
   pitch-black, pitch-dark, pitch-darkness, pitchy, pitchy darkness,
   portending, profound, puzzling, questionable, rank, raven,
   raven-black, rayless, recondite, reprehensible, reprobate,
   restricted, roiled, roily, rotten, sable, sad, satanic, saturnine,
   savagery, scandalous, scowling, secret, secretive, semivisible,
   shadowy, shady, shameful, shameless, shapeless, shapelessness,
   shifty, sightless, sinful, sinister, slippery, sloe, sloe-black,
   sloe-colored, smothered, sober, solemn, somber, sombrous,
   sorrowful, spiritually blind, squally, stark blind, starless,
   starlessness, stifled, stone-blind, stormy, stratiform, stratous,
   subfusc, sulky, sullen, sunless, sunlessness, suntanned,
   suppressed, surly, suspicious, swart, swarth, swarthiness, swarthy,
   tar-black, tarry, tenebrious, tenebrose, tenebrosity, tenebrous,
   tenebrousness, the palpable obscure, threatening, thunderheaded,
   top secret, total darkness, transcendent, tricky, triste, turbid,
   ulterior, unbreatheable, uncertain, unclarity, unclear,
   unclearness, uncommunicative, unconscienced, unconscientious,
   unconscionable, undefined, under security, under wraps, underhand,
   underhanded, undiscerning, undisclosable, undisclosed,
   undivulgable, undivulged, unenlightened, unenlightenment,
   unethical, unfathomable, unfavorable, unforgivable, unfortunate,
   unilluminated, unlighted, unlit, unlucky, unobserving,
   unpardonable, unperceiving, unplain, unplainness, unprincipled,
   unpromising, unpropitious, unrecognizable, unrevealable,
   unrevealed, unsavory, unscrupulous, unseeing, unspeakable,
   unspoken, unstraightforward, untellable, untold, untoward,
   unutterable, unuttered, unwhisperable, unworthy, vague, vagueness,
   velvet darkness, vicious, vile, villainous, visionless, weak,
   weariful, wearisome, weary, wicked, without remorse, without shame,
   wrong

Dark >> D Words
Dark, definition of term: Dark
dark_pag1.html

Dark Horse >> D Words
Dark Horse, definition of term: Dark Horse
dark+horse_pag1.html

Dark Ages >> D Words
Dark Ages, definition of term: Dark Ages
dark+ages_pag1.html

Dark Blue >> D Words
Dark Blue, definition of term: Dark Blue
dark+blue_pag1.html