Synonyms for Rigorous:

• adj.

  •accurate (adjective)
  • de-finite,
  • dis criminative,
  • explicit,
  • dis-criminative,
  • most defined,
  • ultraprecise,
  • on the money,
  • matter-of-fact,
  • de-tailed,
  • de-fined,
  • de tailed,
  • re-gular,
  • more concrete,
  • un mistakable,
  • un erring,
  • de finite,
  • ultra-precise,
  • ultra precise,
  • unerring,
  • re gular,
  • on money,
  • on button,
  • un-mistakable,
  • de fined,
  • un-erring,
  • dis criminating,
  • more ultraprecise,
  • more defined,
  • dis-criminating,
  • on nose,
  • most ultraprecise.
  •all (adjective)
  • rigorous.
  •arduous (adjective)
  • more murder,
  • up hill,
  • most murder,
  • up-hill,
  • strenuous,
  • painful.
  •austere (adjective)
  • in exorable,
  • un-feeling,
  • more serious,
  • un relenting,
  • in-exorable,
  • forbidding,
  • un feeling,
  • formal,
  • un-relenting,
  • somber.
  •bitter (adjective)
  • dis-pleasing,
  • un-palatable,
  • galling,
  • in temperate,
  • dis pleasing,
  • dis-agreeable,
  • in tenser,
  • un pleasant,
  • un-pleasant,
  • in-tense,
  • dis-tasteful,
  • in-tensest,
  • dis agreeable,
  • in-temperate,
  • in tense,
  • dis tasteful,
  • un palatable,
  • in-tenser.
  •careful (adjective)
  • going great lengths,
  • most thorough,
  • more selfdisciplined,
  • most selfdisciplined,
  • more careful,
  • observant,
  • more thorough,
  • de liberate,
  • self disciplined,
  • de-liberate.
  •correct (adjective)
  • undistorted,
  • right as rain,
  • dead on,
  • unmistaken,
  • free of error,
  • stoner,
  • on the beam,
  • righteous,
  • on target,
  • on track,
  • cooking with gas.
  •economical (adjective)
  • spartan.
  •exact (adjective)
  • ex-press,
  • bulleye,
  • ex act,
  • nailed down,
  • more conscionable,
  • clearcut,
  • bulls eye,
  • ex press,
  • most conscionable,
  • bull'seye,
  • un-equivocal,
  • bullseye,
  • un equivocal,
  • on numbers,
  • bull-eye,
  • ex-act,
  • bull eye.
  •exacting (adjective)
  • ex-acting,
  • more nit picking,
  • unsparing,
  • hyper-critical,
  • by book,
  • most nit picking,
  • nit picking,
  • ex acting,
  • un-sparing,
  • most nit-picking,
  • more nit-picking,
  • hyper critical,
  • un sparing.
  •exigent (adjective)
  • superincumbent,
  • more superincumbent,
  • super incumbent,
  • most superincumbent,
  • super-incumbent.
  •fastidious (adjective)
  • epicurean,
  • flawless,
  • accurate,
  • hypercritical,
  • particular,
  • conscientious,
  • priggish,
  • dainty,
  • fastidious,
  • discriminating,
  • discerning,
  • proper,
  • literal,
  • critical,
  • Qualmish,
  • diligent,
  • squeamish,
  • punctilious,
  • choosy,
  • prim,
  • picky,
  • perspicacious,
  • prudish,
  • delicate,
  • meticulous,
  • finicky,
  • mincing,
  • methodical,
  • fussy,
  • severe,
  • persnickety.
  •hard (adjective)
  • Toilful,
  • coldblooded,
  • Operose,
  • Difficile,
  • hard as nails,
  • uphill battle,
  • harder,
  • hardboiled.
  •inalterable (adjective)
  • in alterable,
  • in-alterable.
  •inflexible (adjective)
  • re solute,
  • set in ways,
  • un-changeable,
  • in-tractable,
  • un-swayable,
  • Unswayable,
  • most unadaptable,
  • re-solute,
  • set one ways,
  • in flexible,
  • stand ground,
  • stand ones ground,
  • single minded,
  • un-compliant,
  • most unswayable,
  • un bending,
  • in tractable,
  • un compromising,
  • steeliest,
  • un-compromising,
  • dyed in the wool,
  • un-bending,
  • hard and fast,
  • un-yielding,
  • un compliant,
  • set ones ways,
  • un yielding,
  • un-adaptable,
  • steelier,
  • set ways,
  • set in ones ways,
  • un adaptable,
  • more unswayable,
  • stand one ground,
  • set in one ways,
  • in-flexible,
  • un swayable,
  • more unadaptable,
  • set one's ways,
  • un changeable.
  •nice (adjective)
  • be-fitting,
  • well bred,
  • more hairsplitting,
  • de cent,
  • most finicking,
  • wellbred,
  • be-coming,
  • well-bred,
  • de-cent,
  • most hairsplitting,
  • more finicking.
  •onerous (adjective)
  • more headache,
  • over taxing,
  • over powering,
  • most embittering,
  • more crushing,
  • most plodding,
  • most overtaxing,
  • most crushing,
  • over-taxing,
  • over-powering,
  • more plodding,
  • more embittering,
  • more overtaxing,
  • most headache.
  •peremptory (adjective)
  • in controvertible,
  • un deniable,
  • in-controvertible,
  • in tolerant,
  • in-tolerant,
  • high handed,
  • un-deniable.
  •precise (adjective)
  • definite,
  • right.
  •prudish (adjective)
  • de-mure,
  • up tight,
  • most overnice,
  • de mure,
  • more overexact,
  • more simpering,
  • overexact,
  • narrowminded,
  • over modest,
  • more overnice,
  • over exact,
  • over-exact,
  • overnice,
  • most overmodest,
  • most simpering,
  • more overmodest,
  • up-tight,
  • over nice,
  • most overexact,
  • narrow minded.
  •relentless (adjective)
  • un-stoppable,
  • un forgiving,
  • most hang tough,
  • un-flinching,
  • stop nothing,
  • bound determined,
  • in-human,
  • most unstoppable,
  • stop at nothing,
  • most undeviating,
  • more hang tough,
  • unstoppable,
  • more unstoppable,
  • most hang-tough,
  • un stoppable,
  • unforgiving,
  • un-forgiving,
  • un deviating,
  • hangtough,
  • un-appeasable,
  • most hangtough,
  • more undeviating,
  • un flinching,
  • more hang-tough,
  • un appeasable,
  • un-deviating,
  • in human,
  • more hangtough.
  •religious (adjective)
  • un swerving,
  • un-swerving.
  •remorseless (adjective)
  • more unrepenting,
  • un contrite,
  • more unregenerate,
  • un-compassionate,
  • more uncontrite,
  • un repenting,
  • un-contrite,
  • in humane,
  • most hard-hearted,
  • most uncontrite,
  • un compassionate,
  • most hard hearted,
  • hard bitten,
  • in-humane,
  • most unregenerate,
  • un-repenting,
  • un regenerate,
  • more hard hearted,
  • more hard-hearted,
  • most unrepenting,
  • un-remitting,
  • in sensitive,
  • un remitting,
  • hard hearted,
  • in-sensitive.
  •right (adjective)
  • most inerrant,
  • in-errant,
  • in dubitable,
  • in fallible,
  • more inerrant,
  • un doubted,
  • more watertight,
  • in errant,
  • in-dubitable,
  • un-doubted,
  • most watertight,
  • in-fallible.
  •rigid (adjective)
  • more unpermissive,
  • un-permissive,
  • in-compliant,
  • un-changing,
  • unbreakable,
  • most chiseled,
  • in elastic,
  • tough nut crack,
  • un-breakable,
  • un breakable,
  • un-alterable,
  • un alterable,
  • un permissive,
  • un moving,
  • in compliant,
  • more chiseled,
  • in-variable,
  • hardline,
  • unpermissive,
  • un-moving,
  • set stone,
  • in-elastic,
  • strait laced,
  • most unpermissive,
  • in variable,
  • un changing.
  •severe (adjective)
  • unbending,
  • obdurate,
  • grim,
  • brusque,
  • stark,
  • ascetic,
  • acrimonious,
  • bleak,
  • cool,
  • oppressive,
  • caustic,
  • brisk,
  • curt,
  • acerbic,
  • blunt,
  • sharp,
  • dry,
  • imperial,
  • frosty,
  • basic,
  • chilly,
  • stern,
  • intense,
  • uncompromising,
  • gruff,
  • dour,
  • abrupt,
  • astringent,
  • icy,
  • intolerant,
  • hidebound,
  • authoritarian,
  • short,
  • spare,
  • keen,
  • lean,
  • strait-laced,
  • obstinate,
  • piquant,
  • draconian,
  • cutting,
  • tart,
  • acute,
  • crisp,
  • puritanical,
  • censorious,
  • raw,
  • fundamental.
  •severe; exact (adjective)
  • intemperate,
  • ironhanded.
  •spartan (adjective)
  • most disciplined,
  • un daunted,
  • un-daunted,
  • more disciplined.
  •stern (adjective)
  • more mortified,
  • most mortified,
  • flinty,
  • most stiffnecked,
  • more stiff-necked,
  • most stiff necked,
  • stiff necked,
  • hardshell,
  • hardheaded,
  • more stiffnecked,
  • most hardheaded,
  • stiffnecked,
  • more stiff necked,
  • most stiff-necked,
  • hard nosed.
  •stiff (adjective)
  • un duest,
  • un-due,
  • in-ordinate,
  • un due,
  • un-duer,
  • un-duest,
  • un conscionable,
  • un-conscionable.
  •strict (adjective)
  • more ironfisted,
  • most stickling,
  • most iron fisted,
  • most ironfisted,
  • more stickling,
  • iron fisted,
  • most iron-fisted,
  • more iron fisted,
  • nononsense,
  • more iron-fisted.
  •stringent (adjective)
  • more brickwall,
  • most drawing,
  • most brick-wall,
  • more confining,
  • most brickwall,
  • more brick wall,
  • more brick-wall,
  • brickwall,
  • more drawing,
  • most confining,
  • most brick wall.

• n.

  •
  • extreme,
  • profound,
  • grave,
  • serious,
  • dire,
  • awful.
  •
  • organized,
  • thorough,
  • provident,
  • painstaking,
  • systematic,
  • cautious,
  • usual.
  •
  • full.
  •
  • honest,
  • real.
  •
  • rough.
  •brutal (noun)
  • brutal.
  •cruel (noun)
  • cruel.
  •demanding (noun)
  • demanding.
  •exact (noun)
  • dogmatic.
  •harsh (noun)
  • harsh.
  •rigorous (noun)
  • tight,
  • unkind.

• Other synonyms:

  •
  • difficult,
  • effortful,
  • fervid,
  • keenly,
  • grievous,
  • sublime,
  • desperate,
  • severely,
  • towering,
  • scalding,
  • heavy-duty,
  • gross,
  • extravagant,
  • ultimate,
  • errorless,
  • backbreaking,
  • fatally,
  • frontal,
  • ferocious,
  • dearly,
  • dreadfully.
  •
  • spectacular,
  • far,
  • massive,
  • trying,
  • supreme,
  • laborious,
  • fatal,
  • merciless,
  • terminal,
  • burdensome,
  • Searing,
  • hardy,
  • veridical,
  • unbearable,
  • explosive,
  • sharply,
  • badly.
  •
  • savage,
  • veracious,
  • sore,
  • weighty,
  • high-level,
  • crushing.
  •
  • taxing,
  • faithful,
  • true.
  •
  • formidable,
  • tough.
  •
  • strong.
  •
  • heavy.
  •harsh
  • peremptory.
  •relentless
  • remorseless.

Paraphrases for Rigorous:

• Equivalence

  • Adjective
    strict, stricter, rigourous.

• Independent

  • Adjective
    precise, onerous, careful, accurate, restrictive, strenuous, painstaking, conscientious, detailed, uncompromising, stern, strictly, stiff, demanding, draconian, aggressive, grim, forceful, in-depth, diligent, burdensome, intransigent, high, challenging, methodical, exact, extensive, arduous, intense, hard, systematic, close, sophisticated, thrifty, inflexible, rough, comprehensive, compelling, resolute, fierce, authoritative, faithful, coherent, stark, cautious, economical.
  • Verb, gerund or present participle
    demanding.

• Other Related

  • Adjective
    rigid, tough, harsh, scrupulous, meticulous, rigour, strong, robust, disciplined, tight, serious, austere, consistent, drastic, intensive, hard-hitting, stringency, thoroughgoing, exhaustive, energetic.
  • Noun, singular or mass
    rigour, rigor, stringency.

Antonyms for Rigorous:

• adj.

  • severe; exact
    improper, unsuitable, lax, inexact, loose, flexible, easy-going.
  • Other antonyms:
    accessible, effortless, amenable, responsive, patient, smooth, cheap, slipshod, pliable, dubious, softhearted, tolerant, careless, bland, uncomplicated, sloppy, untrue, clement, indefinite, spoiling, genial, mindless, mild, kind, manageable, merciful, sweet, willing, negligent, forbearing, indulgent, easy, inaccurate, tender, coarse, soothing, false, charitable, comforting, remiss, accepting, round, vague, simple, soft, tractable, gentle, wrong, approximate, untrustworthy, light, questionable, laid-back, clear, complaisant, compromising, user-friendly, elementary, unreliable, slovenly, affable, doubtful, unclear, doable, yielding, incorrect, friendly, neglectful, facile, achievable, pliant, painless, compliant, pampering, imprecise, kindly, agreeable, lenient, acquiescent, rough.

• Other antonyms:

  • n.
    capricious.

Homophones for Rigorous:

• recherche, racehorse, regorge, recourse, ricrac, rush rose, research, recharge, rock rose, rockcress, resurge, regress, resource, race horse, ricegrass, rush-grass, rogers, rush grass, rockers, rye grass, rock hyrax, rock cress, ryegrass, rockrose, rickrack, rice grass, racecourse.