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unimaginable

British  
/ ˌʌnɪˈmædʒɪnəbəl /

adjective

  1. difficult or impossible to believe; inconceivable

"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

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

So imagine how unimaginable it was 80 years ago, when the unit distance problem was posed by Paul Erdős, known as the most prolific mathematician in history.

From The Wall Street Journal • May 30, 2026

"Our hearts and prayers are with the families who have lost their beloved daughters," President William Ruto said on X, describing it as an "unimaginable tragedy".

From Barron's • May 28, 2026

"Jason Thomas was an experienced offshore worker who lost his life in the most unimaginable way possible," he said.

From BBC • May 18, 2026

Cater said the forum had "caused unimaginable pain and suffering for bereaved families across the UK and beyond, and no punishment can undo that harm".

From BBC • May 13, 2026

Ernest Lawrence was being mentioned in quarters and in contexts that only a year or two earlier would have been unimaginable.

From "Big Science" by Michael Hiltzik

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