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Synonyms

unbelievable

American  
[uhn-bi-lee-vuh-buhl] / ˌʌn bɪˈli və bəl /

adjective

  1. too dubious or improbable to be believed.

    an unbelievable excuse.

  2. so remarkable as to strain credulity; extraordinary.

    the unbelievable fury of the storm; an unbelievable athlete.
unbelievable British  
/ ˌʌnbɪˈliːvəbəl /

adjective

  1. unable to be believed; incredible or astonishing

"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

Other Word Forms

  • unbelievability noun
  • unbelievably adverb

Etymology

Origin of unbelievable

First recorded in 1540–50; un- 1 + believe ( def. ) + -able ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The 76-year-old said he was "delighted" to this week be granted full British citizenship and thanked the people of Wirral for their "unbelievable" support.

From BBC

Their story is unbelievable—and part of a horrifying trend.

From The Wall Street Journal

Augustus Strong found Kate Fox cute and entertaining but her so-called spirits unbelievable.

From Literature

"It's sad and devastating and really unbelievable," he said.

From BBC

"It is unbelievable the amount of students that use The Pantry, we have over 200 students visiting every day," Amy Smith said.

From BBC

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.