[ 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

OTHER WORDS FROM unbelievable

un·be·liev·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for unbelievably

British Dictionary definitions for unbelievably (1 of 2)

/ (ˌʌnbɪˈliːvəblɪ) /


in a manner that is hard to believe; astonishinglyit gets unbelievably hot
(sentence modifier) it is hard to believe that; incrediblyunbelievably, he remained utterly cheerful

British Dictionary definitions for unbelievably (2 of 2)

/ (ˌʌnbɪˈliːvəbəl) /


unable to be believed; incredible or astonishing

Derived forms of unbelievable

unbelievability 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