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 company hit that once unfathomable goal by the third quarter of 2024, and the company’s market capitalization has skyrocketed by another 370% since to $125 billion, amid a frenzy for anything remotely AI-adjacent. Matt Durot, Forbes.com, 19 May 2025 The other features unfathomable darkness and is depicted comically in Silverman’s memoir, Bedwetter, and the still-developing Bedwetter: The Musical, with music by the late Adam Schlesinger. Stephen Rodrick, Rolling Stone, 18 May 2025 The impact of my violent actions on my family ... is unfathomable. Sonam Sheth, MSNBC Newsweek, 14 May 2025 While the pain of losing a loved one is unfathomable, some find remarkable ways to honor their memory. Maquita Peters, NPR, 11 May 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 25 May. 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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