1. incredible, unbelievable - beyond belief or understanding; "at incredible speed"; "the book's plot is simply incredible"
   Antonyms: credible, believable, likely, plausible, presumptive
   

Adjective

1. Unbelievable; difficult to believe or too extraordinary to be possible.

Example sentence: The magician performed an incredible trick, making a car disappear before our very eyes.

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Noun

1. An extraordinary or remarkable person or thing.

Example sentence: Albert Einstein was an incredible in the field of theoretical physics.

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Adverb

1. Extremely; remarkably; exceptionally.

Example sentence: She played the piano incredibly well, stunning the audience with her talent.

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Related Words:

Amazing

Unbelievable

Extraordinary