unfathomable
adjective
un·fath·om·able
ˌən-ˈfa-t͟hə-mə-bəl 
: not capable of being fathomed:
a
: immeasurable
… the unfathomable darkness of empty space.—
H. G. Wells
H. G. Wells
b
: impossible to comprehend
unfathomable motives/reasons
Examples of unfathomable in a Sentence
His behavior is completely unfathomable.
the unfathomable reaches of space
Recent Examples on the Web
In his work, the unfathomable is what most powerfully involves us—some private kernel of feeling that resists interpretation, and always remains out of reach.
—Sebastian Smee, The Atlantic, 16 May 2026
There is no way to fill the unfillable void left by Ashly's passing and no way to make sense of this unfathomable loss.
—Luke Chinman, PEOPLE, 6 May 2026
That's unfathomable, especially in a market like Boston.
—Zach Dean Outkick, FOXNews.com, 27 Apr. 2026
This release coincides with the tenth anniversary of the death of His Purple Highness, the singer, songwriter, producer, philanthropist, musician and multi-instrumentalist with an unfathomable life and work.
—Darío Gael Blanco, Vanity Fair, 25 Apr. 2026
See All Example Sentences for unfathomable
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.
Sebastian Smee, The Atlantic, 16 May 2026
There is no way to fill the unfillable void left by Ashly's passing and no way to make sense of this unfathomable loss.
—Luke Chinman, PEOPLE, 6 May 2026
That's unfathomable, especially in a market like Boston.
—Zach Dean Outkick, FOXNews.com, 27 Apr. 2026
This release coincides with the tenth anniversary of the death of His Purple Highness, the singer, songwriter, producer, philanthropist, musician and multi-instrumentalist with an unfathomable life and work.
—Darío Gael Blanco, Vanity Fair, 25 Apr. 2026
See All Example Sentences for unfathomable
Cite this Entry
“Unfathomable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfathomable. Accessed 21 May. 2026.
Copy CitationKids Definition
unfathomable
adjective
un·fath·om·able
ˌən-ˈfat͟h-ə-mə-bəl
Love words? Need even more definitions?
Merriam-Webster unabridged
