Definition for Illogical:

• Contrary to the rules of logic or sound reasoning.

Synonyms for Illogical:

• adj.

  •absurd (adjective)
  • eccentric,
  • crazy,
  • contradictory,
  • bizarre,
  • outlandish,
  • paradoxical,
  • senseless,
  • idiotic,
  • anachronistic,
  • inane,
  • screwy,
  • inconsistent,
  • incongruous,
  • stupid,
  • impossible,
  • ludicrous,
  • batty,
  • preposterous,
  • silly,
  • nonsensical,
  • invalid,
  • Daffy,
  • meaningless,
  • farcical,
  • fallacious,
  • self-contradictory,
  • absurd,
  • foolish,
  • dippy,
  • implausible,
  • laughable,
  • irrational,
  • ridiculous.
  •all (adjective)
  • unlogical.
  •disconnected (adjective)
  • disordered,
  • loose,
  • garbled,
  • jumbled,
  • muddled,
  • mixed-up,
  • disjointed,
  • rambling,
  • incoherent,
  • unintelligible,
  • uncoordinated,
  • broken.
  •erroneous (adjective)
  • defective,
  • fallacious,
  • botched,
  • erroneous,
  • misestimated,
  • incorrect,
  • miscalculated,
  • mistaken,
  • distorted,
  • Misconstrued,
  • misjudged,
  • false,
  • Misconceived,
  • faulty,
  • marred,
  • inaccurate,
  • flawed.
  •fallacious (adjective)
  • delusory,
  • reasonless,
  • erroneous,
  • mistaken,
  • unreal,
  • unfounded,
  • delusive,
  • untrue,
  • illusory,
  • ungrounded,
  • Unreasoned,
  • deceptive.
  •false (adjective)
  • unsound.
  •far-fetched (adjective)
  • eccentric,
  • inconsequential,
  • unlikely,
  • improbable,
  • unrealistic,
  • bizarre.
  •flimsy (adjective)
  • weak,
  • baseless,
  • puerile.
  •groundless (adjective)
  • unwarranted,
  • flimsy,
  • unjustified.
  •illogical (adjective)
  • unsubstantial,
  • cockeyed,
  • untenable,
  • unscientific,
  • nutty,
  • not following,
  • self-contradictory,
  • false,
  • fatuous,
  • faulty,
  • irrelevant,
  • sophistic,
  • irrational,
  • meaningless,
  • incorrect,
  • inconclusive,
  • sophistical,
  • specious,
  • senseless,
  • mad,
  • fallacious,
  • unreasonable,
  • hollow,
  • inconsistent,
  • casuistic,
  • without basis,
  • unsound,
  • wacky,
  • inconsequent,
  • spurious,
  • incongruous,
  • unconnected,
  • absurd,
  • unproved,
  • groundless,
  • invalid,
  • preposterous,
  • screwy,
  • implausible.
  •impossible (adjective)
  • unthinkable.
  •impractical/impracticable (adjective)
  • quixotic,
  • unwise,
  • unworkable,
  • romantic,
  • wild,
  • unusable,
  • visionary,
  • impossible.
  •inane (adjective)
  • asinine,
  • ridiculous,
  • mindless,
  • vacuous,
  • vacant,
  • unintelligent,
  • imbecilic,
  • pointless,
  • daft.
  •incongruous (adjective)
  • conflicting,
  • incongruent,
  • contradictory,
  • distorted.
  •indefensible (adjective)
  • untenable.
  •thoughtless (adjective)
  • fatuous,
  • empty-headed,
  • unthinking,
  • unreasonable,
  • blank,
  • mindless,
  • brainless,
  • vacant,
  • unoccupied,
  • vacuous,
  • inane,
  • thoughtless,
  • unthoughtful.
  •unfounded (adjective)
  • without basis.

• n.

  •
  • perverse,
  • childish,
  • irresponsible.
  •
  • sophistic,
  • unsound,
  • unfounded,
  • specious,
  • spurious.
  •
  • Unreasoned.
  •illogical (noun)
  • confused,
  • disjointed,
  • intuitive,
  • unconnected,
  • disconnected,
  • absurd,
  • unlogical,
  • visceral,
  • garbled,
  • unreasonable,
  • disordered,
  • inconsequential,
  • scattered,
  • nonrational,
  • incoherent.
  •irrational (noun)
  • inconclusive,
  • baseless,
  • specious,
  • not following,
  • inconsequent,
  • fallible,
  • unsubstantial,
  • wrong,
  • unsound,
  • casuistic,
  • wacky,
  • unproved,
  • nutty,
  • groundless,
  • unscientific,
  • screwy,
  • sophistical,
  • without basis,
  • hollow,
  • irrelevant,
  • untenable.

• Other synonyms:

  •
  • sophistic,
  • Unreasoned.
  •
  • flimsy,
  • specious.
  •
  • spurious.
  •causeless
  • groundless.
  •idiotic
  • sappy.
  •illogical
  • illegitimate.
  •indefensible
  • untenable.
  •silly
  • scatterbrained.
  •unrealistic
  • impractical.
  •unsystematic
  • unscientific.
  •vague
  • obscure.
  •Other relevant words:
  • diffuse,
  • unsubstantial,
  • apocryphal,
  • Addle-pated,
  • visceral,
  • insane,
  • unorthodox,
  • disunited,
  • unwitting,
  • batty,
  • improbable,
  • ambagious,
  • untrue,
  • unrealizable,
  • nutty,
  • delusional,
  • Daffy,
  • hollow,
  • untenable,
  • Faultful,
  • weak,
  • inauthentic,
  • cockeyed,
  • unauthentic,
  • unintelligent,
  • spurious,
  • off the mark,
  • mixed-up,
  • inarticulate,
  • deviative,
  • wordy,
  • jumbled,
  • erring,
  • not following,
  • purposeless,
  • bewildered,
  • circumlocutionary,
  • intuitive,
  • disconnected,
  • unsustainable,
  • irresponsible,
  • fallible,
  • unordered,
  • unorganized,
  • blind,
  • illegitimate,
  • unlikely,
  • flimsy,
  • unjustifiable,
  • ungrounded,
  • digressive,
  • amiss,
  • muddle-headed,
  • halfwitted,
  • quixotic,
  • unconsidered,
  • wrong,
  • askew,
  • endless,
  • not right,
  • random,
  • perplexing,
  • puerile,
  • imbecile,
  • unjustified,
  • unrealistic,
  • Paralogical,
  • perverse,
  • unnegotiable,
  • dislocated,
  • farfetched,
  • sappy,
  • periphrastic,
  • daft,
  • unsettled,
  • adrift,
  • sophistic,
  • isolated,
  • tortuous,
  • inexact,
  • out,
  • muddled,
  • scrambled,
  • unworkable,
  • incongruent,
  • laughable,
  • broken,
  • loose,
  • circumlocutory,
  • corrupt,
  • puzzling,
  • asinine,
  • moronic,
  • at fault,
  • problematic,
  • all wet,
  • baffling,
  • Absonant,
  • mad,
  • unperceiving,
  • deceptive,
  • scattered,
  • without basis,
  • gullible,
  • befuddled,
  • ironic,
  • imbecilic,
  • inconclusive,
  • unwise,
  • wide,
  • Unphilosophical,
  • undiscriminating,
  • reasonless,
  • circuitous,
  • nonrational,
  • rambling,
  • unfitting,
  • all off,
  • hasty,
  • interminable,
  • verbose,
  • circular,
  • hare-brained,
  • scatterbrained,
  • wild,
  • dissociated,
  • Rattle-brained,
  • unlogical,
  • unconnected,
  • uncoordinated,
  • unreal,
  • unfounded,
  • oxymoronic,
  • romantic,
  • confounded,
  • risible,
  • mysterious,
  • obscure,
  • disordered,
  • roundabout,
  • rash,
  • Misled,
  • Unreasoned,
  • straying,
  • baseless,
  • contrary to reason,
  • heretical,
  • weird,
  • uninformed,
  • aimless,
  • imprecise,
  • unclear,
  • irrelevant,
  • aberrant,
  • unperceptive,
  • non sequitur,
  • sophistical,
  • baffled,
  • unsound,
  • abroad,
  • fragmented,
  • Absonous,
  • heterodox,
  • unstructured,
  • witless,
  • inconsequent,
  • disoriented,
  • garbled,
  • ironical,
  • bird-brained,
  • casuistic,
  • unproved,
  • delusive,
  • far-fetched,
  • unwarranted,
  • unthinkable,
  • abrupt,
  • Feather-headed,
  • conflicting,
  • groundless,
  • visionary,
  • off,
  • impractical,
  • Circumlocutional,
  • short-sighted,
  • astray,
  • unreflecting,
  • prolix,
  • ambiguous,
  • lost,
  • unacceptable,
  • upset,
  • unlawful,
  • off the track,
  • confusing,
  • disjoined,
  • confused,
  • not on,
  • myopic,
  • bemused,
  • fanciful,
  • foolhardy,
  • deviant,
  • undiscerning,
  • equivocal,
  • errant,
  • childish,
  • disorganized,
  • cold,
  • enigmatic,
  • outrageous,
  • peccant,
  • contrary,
  • unusable,
  • redundant,
  • indefensible,
  • demented,
  • maundering,
  • without reason,
  • unscientific,
  • self-refuting,
  • incomprehensible,
  • unmaintainable,
  • unfactual,
  • dizzy,
  • nonscientific,
  • illusory,
  • at sea,
  • incoherent,
  • screwy,
  • pointless,
  • perverted,
  • simple-minded,
  • inconsequential,
  • imperfect,
  • disjointed,
  • wacky,
  • dippy,
  • bewildering,
  • unintelligible,
  • stray,
  • delusory,
  • specious,
  • awry.

Antonyms for Illogical:

• adj.

  • absurd
    certain, wise.
  • all
    logical.
  • disconnected
    continuous, intelligible, coherent, attached, joined, understandable, connected.
  • fallacious
    truthful, real, true.
  • far-fetched
    believable, realistic, natural, plausible.
  • flimsy
    strong, convincing, serious.
  • groundless
    justified, called-for, Grounded, proven, warranted.
  • illogical
    rational, reasonable, logical, correct, right, sensible, meaningful.
  • impractical/impracticable
    practicable, viable, tenable, practical, probable.
  • inane
    smart, bright, intelligent.
  • incongruous
    compatible, harmonious, corresponding, uniform, suitable, matched, consistent, fitting, congruous.
  • Other antonyms:
    sure, clear, convincing, sane, plausible, wise, corroborated, informed, solid, true, organized, discursive, formal, sober, ordered, cogent, just, credible, consistent, demonstrated, validated, confirmed, ratiocinative, commonsense, dianoetic, compelling, persuasive, enlightened, certain, well-grounded, established, reasoned, substantiated, satisfying, sensible, well-founded.