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.
Blakely, along with 26 other Camp Mystic girls and counselors, perished in the deluge – forcing her family to endure yet another unfathomable tragedy. Pamela Brown, CNN Money, 18 July 2025 But Aicher’s message got through: This wasn’t a pickle, this was a full-fledged disaster, unfolding with unfathomable fury. Mirjam Swanson, Oc Register, 11 July 2025 My parents, Caribbean immigrants who ran a home daycare, had no way of preparing me for these posh young students and their unfathomable stories about ski vacations and summer trips abroad. Frederick Melo, Twin Cities, 10 July 2025 Lately, he’s reverted to grounding out repeatedly in big situations, striking out at the highest rate of his career, and walking at an extremely low rate, including an almost unfathomable zero walks in his past 34 games. David O'Brien, New York Times, 27 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

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Cite this Entry

“Unfathomable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfathomable. Accessed 27 Jul. 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
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