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 unfathomable idea that the track may soon close or be sold is closer to reality than ever. Houston Mitchell, Los Angeles Times, 3 Feb. 2025 But with fires spreading unfathomable destruction, calls to cancel the Grammys, SAG Awards and Oscars came quickly. Elizabeth Wagmeister, CNN, 1 Feb. 2025 The recent images from Los Angeles are both unfathomable and terrifying. Caitlin Clarkson Pereira, Hartford Courant, 24 Jan. 2025 Perkins believed in creating collective structures and institutions to help people in need, through the New Deal, and again through her efforts to aid refugees from the immeasurable and unfathomable tragedy of Nazi Germany. Sara Georgini, Smithsonian Magazine, 21 Jan. 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

Dictionary Entries Near unfathomable

Cite this Entry

“Unfathomable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfathomable. Accessed 8 Feb. 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!