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.
McNeeley was about 4, and playing against first graders, 6- and 7-year olds, which is almost unfathomable. Dom Amore, Hartford Courant, 25 June 2025 In a turn that once seemed unfathomable, Spanish-language music has become a mainstay in the top 10 of the U.S. Billboard 200 and Hot 100 charts, and in 2024 Latin music in the U.S. reached a record-breaking $1.4 billion in revenue. Ernesto Lechner, Los Angeles Times, 24 June 2025 Just two years ago, this move would have seemed unfathomable as Zegras graced the cover of EA’s NHL 24 video game and seemed to be the sort of social media-ready star that the NHL and the Ducks alike would market for years to come. Andrew Knoll, Oc Register, 23 June 2025 This matter-of-fact acceptance of Muslims, their language and culture might seem unfathomable today. Radha Vatsal june 20, Literary Hub, 20 June 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 30 Jun. 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!