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Synonyms

inconceivable

American  
[in-kuhn-see-vuh-buhl] / ˌɪn kənˈsi və bəl /

adjective

  1. not conceivable; unimaginable; unthinkable

  2. unbelievable; incredible.


inconceivable British  
/ ˌɪnkənˈsiːvəbəl /

adjective

  1. incapable of being conceived, imagined, or considered

"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

  • inconceivability noun
  • inconceivableness noun
  • inconceivably adverb

Etymology

Origin of inconceivable

First recorded in 1625–35; in- 3 + conceivable

Explanation

If something is inconceivable, it doesn’t seem possible, it’s hard to imagine, or it can’t be true. It might seem inconceivable that a society would choose to pay bankers more than teachers, but it’s true. When an idea or event is inconceivable, it's so outlandish, amazing, or horrible that it’s hard to believe. The horrible acts committed by the Nazis during the Holocaust are inconceivable on many levels, yet we know they occurred. Some things are inconceivable because they really wouldn't happen — for example, it's inconceivable that you would actually eat your hat.

Keep Reading on Vocabulary.com

Vocabulary lists containing inconceivable

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.

Paramount has set a closing target date of Sept. 30, although the deal faces several regulatory hurdles, so it is not inconceivable that it will get pushed past that date.

From MarketWatch • Mar. 17, 2026

"It was inconceivable that this man who shared my life could have committed these horrors," says Ms Pelicot.

From BBC • Feb. 14, 2026

“I think it’s virtually inconceivable to imagine recovery at this point. Let’s imagine three more years of this,” he said.

From The Wall Street Journal • Jan. 31, 2026

Alibaba ADRs remain priced around $150—up 0.5% in Monday’s premarket—which is just half of the late-2020 high, but a price level that may have been inconceivable in 2022, for instance, when it traded near $60.

From Barron's • Dec. 22, 2025

From her perspective, it was not as inconceivable as others have found it.

From "The Autobiography of Malcolm X" by Alex Malcolm X;Hailey