Synonyms for Un believable:

• adj.

  •amazing (adjective)
  • prodigious,
  • stunning,
  • surprising,
  • fascinating,
  • marvelous,
  • awesome,
  • wonderful,
  • shocking,
  • unbelievable.
  •fabulous (adjective)
  • mind-blowing,
  • striking,
  • extravagant,
  • phenomenal,
  • fantastic,
  • out-of-this-world,
  • super,
  • fab,
  • immense,
  • legendary,
  • Aces,
  • best,
  • spectacular,
  • cool,
  • stupendous,
  • unreal,
  • tops,
  • breathtaking,
  • a-1,
  • groovy,
  • greatest,
  • first-class,
  • superb,
  • wicked,
  • peachy,
  • 10,
  • fictitious,
  • astounding,
  • doozie,
  • turn-on,
  • a-ok,
  • primo,
  • top drawer,
  • remarkable,
  • out-of-sight,
  • rad,
  • terrific,
  • outrageous.
  •fantastic (adjective)
  • foreign,
  • ludicrous,
  • crazy,
  • hallucinatory,
  • erratic,
  • wacky,
  • misleading,
  • eccentric,
  • fictional,
  • foolish,
  • quaint,
  • capricious,
  • irrational,
  • comical,
  • mad,
  • peculiar,
  • out of sight,
  • chimerical,
  • queer,
  • fanciful,
  • extreme,
  • singular,
  • nonsensical,
  • phantasmagorical,
  • grotesque,
  • ridiculous,
  • exotic,
  • artificial,
  • suppositious,
  • whimsical,
  • absurd,
  • illusive,
  • weird,
  • insane,
  • unlikely,
  • imaginative,
  • odd,
  • freakish.
  •fantastical (adjective)
  • glorious,
  • splendid,
  • out of this world,
  • sensational,
  • divine.
  •far-fetched (adjective)
  • inconsequential,
  • illogical,
  • unrealistic,
  • strained,
  • hard to swallow,
  • recondite,
  • forced,
  • labored,
  • strange,
  • suspicious,
  • incoherent,
  • bizarre,
  • unnatural.
  •flimsy (adjective)
  • inadequate,
  • trifling,
  • trivial,
  • superficial,
  • Controvertible,
  • puerile,
  • unreasonable,
  • inane,
  • weakly,
  • wishful,
  • baseless,
  • frivolous,
  • inept,
  • groundless,
  • ungrounded,
  • fallacious,
  • assailable,
  • false,
  • unsatisfactory,
  • feeble,
  • poor,
  • lame,
  • transparent,
  • unpersuasive,
  • contemptible.
  •implausible (adjective)
  • problematic,
  • far out,
  • reachy,
  • farfetched,
  • puzzling,
  • obscure.
  •improbable (adjective)
  • uncertain,
  • hundred-to-one,
  • not expected,
  • rare,
  • slim,
  • iffy,
  • slim and none,
  • unheard of,
  • outside chance.
  •incommunicable (adjective)
  • undescribable,
  • defying description,
  • description.
  •inconceivable (adjective)
  • unheard-of,
  • imcomprehensible,
  • won't fly,
  • extraordinary,
  • unknowable,
  • Insupposable,
  • mind-boggling.
  •incredible (adjective)
  • untenable,
  • rings phony,
  • out of the question.
  •marvelous (adjective)
  • confounding,
  • miraculous,
  • incomprehensible,
  • unusual,
  • supernatural,
  • awful,
  • bewildering,
  • awe-inspiring,
  • difficult to believe,
  • fabulous,
  • wondrous.
  •miraculous (adjective)
  • amazing,
  • unearthly,
  • Supermundane,
  • heavy,
  • unaccountable,
  • inexplicable,
  • anomalous,
  • superior,
  • Thaumaturgic,
  • preternatural,
  • magical,
  • stupefying,
  • numinous,
  • wonderworking,
  • the utmost,
  • monstrous,
  • supranatural,
  • superhuman.
  •obscure (adjective)
  • esoteric,
  • abstruse,
  • indistinct,
  • unintelligible,
  • dim,
  • far-out,
  • deep,
  • illegible,
  • indeterminate,
  • indecisive,
  • inscrutable,
  • intricate,
  • hidden,
  • enigmatic,
  • insoluble,
  • complicated,
  • impenetrable,
  • cryptic,
  • enigmatical,
  • mysterious,
  • arcane,
  • involved,
  • occult,
  • hazy,
  • unclear,
  • unfathomable,
  • confusing,
  • vague,
  • undefined,
  • clear as mud,
  • indefinite,
  • ambiguous,
  • dark,
  • concealed,
  • opaque.
  •preposterous (adjective)
  • laughable,
  • silly,
  • wild,
  • excessive,
  • exorbitant,
  • asinine,
  • taking the cake,
  • senseless,
  • stupid.
  •ridiculous (adjective)
  • goofy,
  • droll,
  • derisory,
  • risible,
  • hilarious,
  • Daffy,
  • jerky,
  • antic,
  • slaphappy,
  • sappy,
  • Gelastic,
  • foolheaded,
  • farcical,
  • nutty,
  • comic.
  •suspect (adjective)
  • shaky,
  • unsure,
  • Doubtable,
  • open,
  • suspected,
  • pseudo.
  •tall (adjective)
  • embellished,
  • overblown,
  • steep,
  • demanding,
  • hard,
  • difficult.
  •thick (adjective)
  • unfair,
  • unjust.
  •thin (adjective)
  • scanty,
  • diluted,
  • skimpy,
  • vapid,
  • scant,
  • meager,
  • sparse,
  • scattered,
  • scarce,
  • stretched,
  • shallow,
  • insubstantial,
  • weak-kneed,
  • slight,
  • flat,
  • sketchy,
  • insufficient.
  •unbelievable (adjective)
  • kooky,
  • thin,
  • beyond belief,
  • flimsy,
  • improbable,
  • open to doubt,
  • won't wash,
  • staggering,
  • flaky,
  • too much,
  • scatterbrained,
  • phony,
  • questionable,
  • doubtful,
  • far-fetched,
  • incredible,
  • cockamamie,
  • for the birds,
  • cockeyed,
  • suspect,
  • past belief,
  • unthinkable,
  • screwy,
  • implausible,
  • fishy,
  • unconvincing,
  • won't hold water,
  • astonishing,
  • thick,
  • unimaginable,
  • weak,
  • Incogitable,
  • lamebrained,
  • outlandish,
  • full of holes,
  • preposterous,
  • reaching,
  • impossible,
  • harebrained,
  • unsubstantial,
  • dubious,
  • inconceivable.
  •ungodly (adjective)
  • horrendous,
  • horrid,
  • uncivilized,
  • barbarous,
  • nasty,
  • atrocious,
  • unconscionable,
  • intolerable,
  • unseemly,
  • dreadful.
  •unheard-of (adjective)
  • novel,
  • unknown,
  • unfamiliar,
  • unsung,
  • unprecedented,
  • nameless,
  • new,
  • exceptional,
  • Unrenowned,
  • undiscovered,
  • little-known.
  •unimaginable (adjective)
  • uncommon,
  • ineffable,
  • not understandable,
  • indescribable,
  • Inapprehensible,
  • unordinary,
  • unique,
  • beyond wildest dreams.
  •unlikely (adjective)
  • remote,
  • out of the ordinary,
  • not likely,
  • contrary,
  • untoward,
  • faint.
  •unreal (adjective)
  • impalpable,
  • intangible,
  • imagined,
  • supposititious,
  • romantic,
  • figmental,
  • sham,
  • imaginary,
  • nebulous,
  • nonexistent,
  • mythical,
  • ostensible,
  • invented,
  • visionary,
  • notional,
  • mock,
  • fabled,
  • phantasmagoric,
  • illusory,
  • delusive,
  • ideal,
  • fictive,
  • dreamlike,
  • theoretical,
  • insincere,
  • seeming,
  • aerial,
  • Storybook,
  • immaterial,
  • pretended.
  •unspeakable (adjective)
  • fearful,
  • frightful,
  • evil,
  • repulsive,
  • overwhelming,
  • beyond words,
  • repugnant,
  • disgusting,
  • inexpressible,
  • inhuman,
  • indefinable,
  • obnoxious,
  • heinous,
  • unutterable,
  • loathsome,
  • horrible,
  • beastly,
  • odious,
  • dire,
  • alarming,
  • detestable,
  • calamitous,
  • appalling,
  • revolting,
  • frightening,
  • repellent,
  • abominable,
  • Incommunicable,
  • execrable,
  • offensive.
  •unsubstantial (adjective)
  • vaporous.
  •unthinkable (adjective)
  • insupportable,
  • beyond possibility.
  •weak (adjective)
  • incompetent,
  • pathetic,
  • raw,
  • lacking,
  • untrained,
  • invalid,
  • spineless,
  • incomplete,
  • unprepared,
  • unqualified,
  • flabby,
  • immature,
  • inconclusive,
  • impotent,
  • wanting,
  • green,
  • faulty,
  • handicapped,
  • substandard,
  • hollow,
  • ineffectual,
  • ineffective,
  • limited,
  • small,
  • forceless.

Antonyms for Un believable:

• adj.

  • amazing
    insignificant, poor, unamazing, ordinary, bad.
  • fabulous
    inferior, expected, usual, common, plain, regular, normal, simple.
  • fantastic
    logical, small, realistic, balanced, unimaginative, sane, sensible, customary, unpleasant, serious, tiny, conventional, rational, commonplace, little, Familiar.
  • far-fetched
    natural.
  • flimsy
    firm, strong, solid, substantial, sturdy, convincing, efficient, able, tough, heavy, thick.
  • implausible
    possibly, probably.
  • improbable
    ostensible, probable.
  • inconceivable
    fathomable.
  • incredible
    terrible.
  • marvelous
    paltry, ugly, worthless, boring, standard, inconsiderable.
  • miraculous
    dull, genuine, average.
  • obscure
    explicit, exposed, perceptible, open, straightforward, apparent, obvious, public, famous, understood, clear, definite, distinguished, unmysterious, known, bare, uncovered, visible, bright.
  • preposterous
    practical, sound, wise, good, responsible, smart, intelligent.
  • suspect
    trusted, trustworthy, innocent.
  • tall
    mild, short, low.
  • thick
    loose, diluted, watery, attenuated, uncrowded, unfriendly, slight, unsociable.
  • thin
    fat, inflated, obese, concentrated, dense, adequate, undiluted, full, sufficient.
  • unbelievable
    imaginable, likely, real, conceivable, possible, believable, reasonable, plausible, tenable, credible.
  • unconvincing
    cogent, certain, persuasive, sure.
  • ungodly
    godly, pious, religious, moral, clean.
  • unheard-of
    unexceptional.
  • unimaginable
    describable.
  • unreal
    authentic.
  • unspeakable
    likeable, delightful, comforting, definable, pleasant, pleasing, nice, wonderful.
  • unsubstantial
    undeniable, well-founded.
  • unthinkable
    cheap.
  • weak
    effective, competent, capable, loud, enough, safe, fit, bold, potent, noisy, protected, secure, confident, guarded, brave.