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Definition of fathomless

fathomless

/ˈfæð.əm.ləs/
fath · om · less
Adverb:fathomlessly
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fathomless Lexical Profile

fathomless Game Scores & Validity

• adjective

1

Extremely deep or vast; impossible to measure the depth or extent of.

Example

"The submarine descended slowly into the fathomless darkness of the ocean trench."

2

Impossible to fully understand, comprehend, or explain.

Example

"She looked at him with an expression of fathomless sorrow that words could never capture."

Synonyms
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Antonyms
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• Nearby Words

fatherly
fathom
fathomable
fathomless
fatigue
fatigues
fatimah

Word Origin & Etymology

Formed in Middle English from 'fathom'—which derives from Old English 'fæþm', originally meaning the span of a person's outstretched arms and later a six-foot unit of marine depth—combined with the privative suffix '-less'.

Cite this Entry

Wordmom. (2026). Definition of Fathomless. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/fathomless
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