[W/K] :: rigorous

  Rigorous \Rig"or*ous\, 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.
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              We do not connect the scattered phenomena into their
              rigorous unity.                       --De Quincey.
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     2. Severe; intense; inclement; as, a rigorous winter.
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     3. Violent. [Obs.] "Rigorous uproar." --Spenser.
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     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"or*ous*ly, adv. --
          Rig"or*ous*ness, n.
          [1913 Webster]

  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]

  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