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

rigorous \rig"orous\, a. f. rigoureux, ll. rigorosus. see
   rigor.
   1. manifesting, exercising, or favoring rigor; allowing no
      abatement or mitigation; scrupulously accurate; exact;
      strict; severe; relentless; as, a rigorous officer of
      justice; a rigorous execution of law; a rigorous
      definition or demonstration.
      1913 webster

            he shall be thrown down the tarpeian rock
            with rigorous hands.                  --shak.
      1913 webster

            we do not connect the scattered phenomena into their
            rigorous unity.                       --de quincey.
      1913 webster

   2. severe; intense; inclement; as, a rigorous winter.
      1913 webster

   3. violent. obs. "rigorous uproar." --spenser.
      1913 webster

   4. mathematics, logic adhering scrupulously and exactly to
      accepted principles; hence, logically valid; as, a
      rigorous proof.
      pjc

   syn: rigid; inflexible; unyielding; stiff; severe; austere;
        stern; harsh; strict; exact.
        1913 webster -- rig"orously, adv. --
        rig"orousness, n.
        1913 webster
see also:
rigor rig"orously rig"orousness 

[2] : WordNet (r) 2.0

rigorous
     adj 1: rigidly accurate; allowing no deviation from a standard;
            "rigorous application of the law"; "a strict
            vegetarian" syn: strict
     2: demanding strict attention to rules and procedures;
        "rigorous discipline"; "tight security"; "stringent safety
        measures" syn: stringent, tight
     3: used of circumstances especially weather that cause
        suffering; "brutal weather"; "northern winters can be
        cruel"; "a cruel world"; "a harsh climate"; "a rigorous
        climate"; "unkind winters" syn: brutal, cruel, harsh,
         unkind
see also:
strict stringent tight brutal cruel harsh 
unkind 

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

261 moby thesaurus words for "rigorous":
   herculean, siberian, abstruse, accurate, acid, acidulous, acrid,
   acrimonious, acute, adamant, adamantine, adverse, algid,
   antagonistic, arctic, arduous, ascetic, astringent, attentive,
   below zero, biting, bitter, bitterly cold, bleak, boreal, brisk,
   brumal, brutal, burdensome, cast-iron, caustic, close, cold,
   cold as charity, cold as death, cold as ice, cold as marble,
   complex, conflicting, conscientious, constant, contrary, correct,
   counter, counteractive, crisp, critical, cutting, delicate,
   demanding, detailed, detrimental, difficile, difficult, direct,
   double-edged, dour, draconian, drastic, edged, escharotic, even,
   exact, exacting, excessive, exigent, exorbitant, express,
   exquisite, extravagant, extreme, faithful, fierce, fine, finical,
   finicking, finicky, firm, flinty, formidable, freezing,
   freezing cold, frigid, fundamentalist, furious, fussy, gelid,
   glacial, great, grim, hairy, hard, hard-core, hard-earned,
   hard-fought, harmful, harsh, hibernal, hidebound, hiemal, hostile,
   hyperborean, ice-cold, ice-encrusted, icelike, icy, immoderate,
   immovable, immutable, implacable, impliable, in opposition,
   incisive, inclement, inelastic, inerrable, inerrant, inexorable,
   infallible, inflexible, inimical, intemperate, intense,
   intransigent, intricate, iron, ironbound, ironclad, ironhanded,
   irreconcilable, jawbreaking, keen, knotted, knotty, laborious,
   mathematical, mean, meticulous, micrometrically precise,
   microscopic, minute, miserable, mordacious, mordant, muscle-bound,
   narrow, nice, nipping, nippy, no picnic, not easy, numbing,
   obdurate, obstinate, onerous, operose, opposed, opposing, opposite,
   oppressive, orthodox, outrageous, particular, penetrating,
   piercing, pinching, pinpoint, poignant, precise, precisianistic,
   precisionistic, procrustean, proper, punctilious, punctual, purist,
   puristic, puritan, puritanic, raw, refined, relentless, religious,
   religiously exact, right, rigid, rigorist, rigoristic, rock-ribbed,
   rockbound, rough, rugged, scathing, scientific,
   scientifically exact, scrupulous, scrutinizing, set with thorns,
   severe, sharp, sinister, sleety, slushy, snappy, spiny, splitting,
   square, stabbing, steely, steep, stern, stiff, stinging,
   stone-cold, straightlaced, straitlaced, strenuous, stressful,
   strict, strident, stringent, stubborn, subtle, subzero,
   supercooled, tart, thorny, ticklish, toilsome, tough, trenchant,
   tricky, troublesome, troublous, trying, unaffected, unalterable,
   unbending, unchangeable, uncompromising, unconscionable,
   undeviating, unerring, unfavorable, ungiving, unmoved, unrelenting,
   untoward, unyielding, uphill, vehement, venomous, violent,
   virulent, vitriolic, wicked, winterbound, winterlike, wintery,
   wintry, wretched

Rigorous >> R Words
Rigorous, definition of term: Rigorous
rigorous_pag1.html

Rigorous Intuition
...Rigorous Intuition What you don't know can't hurt them. Wednesday, ... ..
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US proposes rigorous spam sentencing | The Register
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www.navs.org.uk | vivisection | inside animal laboratories 'Rigorous' Controls?
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http://www.navs.org.uk/vivisection/inside/controls.htm, score=73, date indexed=November 12, 2005, 7:28 am

Dictionary.com/rigorous
...Characterized by or acting with rigor: a rigorous program to restore ... rigorous. adj 1: rigidly accurate; allowing no deviation from a ... ..
http://dictionary.reference.com/search?q=rigorous, score=69, date indexed=November 14, 2005, 2:28 am

rigorous: Definition, Synonyms and Much More From Answers.com
...Characterized by or acting with rigor: a rigorous program to restore ... WordNet information about rigorous. WordNet 1.7.1 Copyright © 2001 by ... ..
http://www.answers.com/main/ntquery?method=4&dsid=2083&dekey=R1293200&gwp=8&curtab=2083_1&sbid=lc04a, score=62, date indexed=December 17, 2005, 10:48 pm

Reducing Student Stress while Maintaining Rigorous Course Standards
...Maintaining Rigorous Course Standards. We face the difficult problem ... ..
http://www.chemistrycoach.com/page16.htm, score=59, date indexed=December 29, 2005, 7:44 pm

Science Blog - Rigorous, short-term diet-exercise program lowers heart disease ...
...Rigorous, short-term diet-exercise program lowers heart disease risk. ... Rigorous, short-term diet-exercise program lowers heart disease risk. ... ..
http://www.scienceblog.com/community/article172.html, score=59, date indexed=December 29, 2005, 7:59 pm

Rigorous Recycling | csmonitor.com
...Rigorous Recycling. It's uncanny how many Americans apparently aren't ... ..
http://www.csmonitor.com/2002/1227/p10s01-comv.html, score=52, date indexed=January 4, 2006, 1:44 am

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