Synonyms for Incredible:

adj.

all (adjective)
unbelievable.
amazing (adjective)
marvelous, surprising.
extraordinary (adjective)
stupendous, exceptional, curious, phenomenal, fantastic, particular, weird, bizarre, remarkable.
fabulous (adjective)
outrageous, superb.
fanciful (adjective)
fantastical.
fantastic (adjective)
crazy, nonsensical, eccentric, unlikely, comical, foolish, grotesque, ludicrous.
far-fetched (adjective)
doubtful, dubious.
implausible (adjective)
farfetched, flimsy.
improbable (adjective)
dubitable, farfetched, doubtful, unlikely, improbable, implausible.
incredible (adjective)
astounding, absurd, amazing, unimaginable, prodigious, extraordinary, inconceivable, ridiculous, astonishing, preposterous, unthinkable, wonderful, implausible, unbelievable, fabulous, unsubstantial, improbable, outlandish, impossible.
mind-boggling (adjective)
unimaginable.
ridiculous (adjective)
absurd, comical, dubious, preposterous, nonsensical, outlandish, foolish, outrageous, bizarre, ridiculous, poppycock, ludicrous, oddball, eccentric, grotesque, silly, farcical, weird, laughable, curious, crazy.
unbelievable (adjective)
farfetched, implausible, fantastic, unimaginable, preposterous, impossible.

n.

complete, especially, entire, particular, perfectly, literally, altogether, pure, completely, absolute. remarkable, surprising, staggering, unimaginable, unthinkable, unexpected, extraordinary, earth-shattering, sensational, belief. excellent, stupendous, decent, amazing, fine, phenomenal, miraculous, wondrous, good, wonderful, wonder, prodigious, astonishing, tremendous, superb, exceptional, fantastical. incredible (noun)
fabulous, undreamt of, marvelous, astounding, marvellous, unimagined, dumbfounding, undreamed, tall, improbable, dumfounding, undreamt, unbelievable, undreamed of.

Other synonyms:

superb, Unconceivable, wonderful, impossible. astonishing, excellent, amazing, wondrous, tremendous, stupendous. exceptional, prodigious, phenomenal, decent. wonder, fantastical, miraculous. flimsy, unsubstantial. shaky. thin. fine. weak. good. fantastic
inconceivable.
fascinating
sensational.
inconceivable
unimaginable, unthinkable.

Usage examples for incredible

  1. It is incredible that Mary should breathe a word- or if she did that it should reach that man. – The Marriage of William Ashe by Mrs. Humphry Ward