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 notion of drafting Simpson with the 11th pick is unfathomable.
—Barry Jackson, Miami Herald, 1 Apr. 2026
Then men had the grit, the unfathomable grit, to claw back from a 19-point deficit to win one of the most dramatic games in the history of either team.
—Dom Amore, Hartford Courant, 30 Mar. 2026
The industry still cannot come to grips with the previously unfathomable scenario of the strait staying shuttered for a prolonged period of time.
—Jordan Blum, Fortune, 28 Mar. 2026
An unfathomable 6,249 career points.
—Joseph Dycus, Mercury News, 28 Mar. 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.
Barry Jackson, Miami Herald, 1 Apr. 2026
Then men had the grit, the unfathomable grit, to claw back from a 19-point deficit to win one of the most dramatic games in the history of either team.
—Dom Amore, Hartford Courant, 30 Mar. 2026
The industry still cannot come to grips with the previously unfathomable scenario of the strait staying shuttered for a prolonged period of time.
—Jordan Blum, Fortune, 28 Mar. 2026
An unfathomable 6,249 career points.
—Joseph Dycus, Mercury News, 28 Mar. 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 5 Apr. 2026.
Copy CitationKids Definition
unfathomable
adjective
un·fath·om·able
ˌən-ˈfat͟h-ə-mə-bəl
Love words? Need even more definitions?
Merriam-Webster unabridged
