unfathomable

adjective

un·​fath·​om·​able ˌən-ˈfa-t͟hə-mə-bəl How to pronounce unfathomable (audio)
: not capable of being fathomed:
b
: impossible to comprehend
unfathomably adverb

Examples of unfathomable in a Sentence

His behavior is completely unfathomable. the unfathomable reaches of space
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The 24-year-old’s value will remain high and losing him on a free when his contract expires is unfathomable. Matt Woosnam, New York Times, 13 Apr. 2025 Meanwhile, the trajectory the U.S. and world economy are on will create an epic global dislocation, with currently massive and unfathomable costs. Clem Chambers, Forbes.com, 9 Apr. 2025 So for it to be not received well was unfathomable. John W. Dean, MSNBC Newsweek, 6 Apr. 2025 Both unfathomable and intimate in scale, World of Tomorrow uses clones, mental backups, and time travel to make a singularly profound case that the most important thing is the present. James Grebey, Vulture, 6 Mar. 2025 See All Example Sentences for unfathomable

Word History

First Known Use

1640, in the meaning defined above

Time Traveler
The first known use of unfathomable was in 1640

Browse Nearby Words

Cite this Entry

“Unfathomable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfathomable. Accessed 22 Apr. 2025.

Kids Definition

unfathomable

adjective
un·​fath·​om·​able ˌən-ˈfat͟h-ə-mə-bəl How to pronounce unfathomable (audio)
: not capable of being fathomed:
b
: impossible to understand

More from Merriam-Webster on unfathomable

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!