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.
For a disaster so vast and so unfathomable, some sort of grounding feels necessary, some little point to hold on to, some faces to remember, but even the actual story of the bus and its temporary inhabitants feels a touch too small for the grand scale Greengrass is working on here. Kate Erbland, IndieWire, 6 Sep. 2025 And the way that people marginalize and attack the Trans community, especially politically, is unfathomable to me, and so unbearably cruel. Anna Kaufman, USA Today, 4 Sep. 2025 The years slowly moved away from us, its silence uncanny, but the smell of carcasses was unfathomable. Literary Hub, 3 Sep. 2025 The scale of the devastation is unfathomable. R. Daniel Foster, Forbes.com, 27 Aug. 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 15 Sep. 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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