fathomless
Americanadjective
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impossible to measure the depth of; bottomless.
-
impossible to understand; incomprehensible.
fathomless motives.
adjective
Other Word Forms
Etymology
Origin of fathomless
Explanation
Something fathomless is so deep or great that you can’t measure it, or so mysterious that nobody can understand it. If you were an ant, you’d probably think the kitchen sink was fathomless — and also the whole business of washing dishes! Fathomless means about the same as the more common word unfathomable. You might choose fathomless in a poem, or in any piece of writing where you want to sound a little more elegant or literary — or use three syllables instead of five! In your reading you might come across expressions like "fathomless oceans" or "the fathomless universe." Figuratively, knowledge, love, evil, and wealth are often described as fathomless.
Vocabulary lists containing fathomless
Wolf Brother
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The Suffix -ness, Part 4
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The alternative, Red Ambience, drenches the car in a fathomless shade of garnet metallic.
From The Wall Street Journal • May 2, 2026
To feel and smell the reality of 12.4 million square miles of frozen expanse, to place upon a scale the fathomless weight of that much ice pressed upon the earth, left me winded.
From Salon • May 29, 2023
The end of the shipping container is open, and I stare into that fathomless black square, listening.
From Slate • Apr. 29, 2023
I’ll pull out just one such gem, for it illustrates the timeliness of the author’s approach to the fathomless depths of his subject.
From Washington Post • Oct. 25, 2022
Only the web of golden light glowed up from the fathomless depths, growing fainter and fainter until it was finally swallowed by the darkness.
From "City of the Plague God" by Sarwat Chadda
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
