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Definition of incredible : Not credible; surpassing belief; too extraordinary and improbable to admit of belief; unlikely; marvelous; fabulous.

Synonyms:

particular, flimsy, fantastical, decent, prodigious, who would have thought...?, undreamt of, shaky, marvelous, thin, incredulous, extraordinary, absolute, perfectly, marvellous, wondrous, exceptional, unbelievable, tall, belief, wonder, wonderful, earth-shattering, unthinkable, phenomenal, is that a fact?, unimagined, amazing, sensational, pure, inconceivable, unconceivable, unsubstantial, stupendous, now I've seen everything/it all, excellent, remarkable, heavens above, good, unconvincing, staggering, funnily enough, unexpected, undreamt, miraculous, especially, astounding, completely, entire, of all things/people/places, dumbfounding, Well, I never, dumfounding, weak, uncompelling, fine, you don't say, surprising, altogether, fabulous, actually, literally, undreamed, complete, astonishing, you would not believe, superb, tremendous, undreamed of, likely

farfetched, dubitable, implausible, improbable, unlikely, doubtful

impossible, fantastic, unimaginable

grotesque, weird, outlandish, ludicrous, preposterous, dubious, absurd, nonsensical, eccentric, bizarre, oddball, crazy, farcical, comical, poppycock, ridiculous, silly, curious, outrageous, laughable, foolish

Usage examples:

• Say, if it can be possible, that it is not all true, though apparently incredible. - "Irish Race in the Past and the Present", Aug. J. Thebaud.
• Had the incredible occurred, then? - "Hilda Lessways", Arnold Bennett.
• It seemed incredible, beyond the bounds of possibility. - "The Bars of Iron", Ethel May Dell.