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
The film captures how the siblings came together to gain closure after an unfathomable loss.
—Liam Quinn, PEOPLE, 5 Dec. 2025
Kimberly Craig says the death of her husband, 52-year-old Antonio Craig, is unfathomable.
—Alysia Burgio, CBS News, 1 Dec. 2025
At its center is a story of two parents buckling under the weight of unfathomable loss.
—Nathan Smith, Time, 26 Nov. 2025
This is an almost unfathomable chasm.
—Jonathan Lansner, Oc Register, 25 Nov. 2025
See All Example Sentences for unfathomable
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Liam Quinn, PEOPLE, 5 Dec. 2025
Kimberly Craig says the death of her husband, 52-year-old Antonio Craig, is unfathomable.
—Alysia Burgio, CBS News, 1 Dec. 2025
At its center is a story of two parents buckling under the weight of unfathomable loss.
—Nathan Smith, Time, 26 Nov. 2025
This is an almost unfathomable chasm.
—Jonathan Lansner, Oc Register, 25 Nov. 2025
See All Example Sentences for unfathomable
Cite this Entry
“Unfathomable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfathomable. Accessed 10 Dec. 2025.
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unfathomable
adjective
un·fath·om·able
ˌən-ˈfat͟h-ə-mə-bəl
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