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[fath -uh m-lis] /ˈfæð əm lɪs/
impossible to measure the depth of; bottomless.
impossible to understand; incomprehensible:
fathomless motives.
Origin of fathomless
First recorded in 1600-10; fathom + -less
Related forms
fathomlessly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for fathomless
Contemporary Examples
Historical Examples
  • The fathomless eyes, full of gloom and of an immense despair, did not close.

    Doctor Pascal Emile Zola
  • She had probed its depth and found it fathomless––fathomless in its devotion to herself.

  • There is a fathomless look in his eyes and he is cold and unresponsive.

    Mary Louise in the Country L. Frank Baum (AKA Edith Van Dyne)
  • It is the home of the Archean granite, and its basins are of a fathomless dust.

    Whispering Smith Frank H. Spearman
  • All the cone trembled as if it was about to plunge into a fathomless gulf.

  • What can the world give her, adequate to her fathomless wants?

    The Young Maiden

    A. B. (Artemas Bowers) Muzzey
  • In storm all is magnificence; in calm there is the brooding of a fathomless peace.

    The Cornwall Coast Arthur L. Salmon
  • What fathomless duplicity was hers, that she could appear so innocent.

    The Octopus Frank Norris
  • The fathomless and swelling cerulean is to him as the scenery of his birth place.

British Dictionary definitions for fathomless


another word for unfathomable
Derived Forms
fathomlessly, adverb
fathomlessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fathomless

1630s, literal; 1640s, figurative; from fathom + -less.

Online Etymology Dictionary, © 2010 Douglas Harper
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