unbelievable

[ uhn-bi-lee-vuh-buh l ]
/ ˌʌn bɪˈli və bəl /

adjective

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 formsun·be·liev·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unbelievable

British Dictionary definitions for unbelievable

unbelievable

/ (ˌʌnbɪˈliːvəbəl) /

adjective

unable to be believed; incredible or astonishing
Derived Formsunbelievability or 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

Word Origin and History for unbelievable

unbelievable


adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper