Try Our Apps


90s Slang You Should Know


[uhn-bi-lee-vuh-buh l] /ˌʌn bɪˈli və bəl/
too dubious or improbable to be believed:
an unbelievable excuse.
so remarkable as to strain credulity; extraordinary:
the unbelievable fury of the storm; an unbelievable athlete.
Origin of unbelievable
1540-50; un-1 + believable
Related forms
unbelievably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for unbelievable
Contemporary Examples
Historical Examples
  • It indicates what unbelievable illusions the sense of touch is capable of causing.

    Criminal Psychology Hans Gross
  • But it was all so unbelievable that he hadn't the nerve to cry out.

  • I saw men in the frenzy of combat swept into moments of unbelievable ferocity.

    The Wasted Generation Owen Johnson
  • It must have been unbelievable but for the definite evidence of it all.

    The Heart of Unaga Ridgwell Cullum
  • That their small wings could wring such a sound from the fabric of the air was unbelievable.

    Edge of the Jungle William Beebe
British Dictionary definitions for unbelievable


unable to be believed; incredible or astonishing
Derived Forms
unbelievability, unbelievableness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for unbelievable

1540s, from un- (1) "not" + believable. Related: Unbelievably.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for unbelievable

Few English speakers likely know this word

Word Value for unbelievable

Scrabble Words With Friends

Nearby words for unbelievable