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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
1600-10; fathom + -less
Related forms
fathomlessly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for fathomless
Contemporary Examples
Historical Examples
  • Her hair was carelessly arranged, and her bonnet awry--unerring indications of fathomless female misery.

    Round the Block John Bell Bouton
  • 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)
  • But the fathomless expression of happiness upon Sophie's uplifted face struck through her gloom and pain.

    Bressant Julian Hawthorne
  • All the cone trembled as if it was about to plunge into a fathomless gulf.

  • How the returning tide used to sweep through that to us fathomless gulch!

    A Labrador Doctor Wilfred Thomason Grenfell
  • What can the world give her, adequate to her fathomless wants?

    The Young Maiden A. B. (Artemas Bowers) Muzzey
  • Gray eyes alone—misty, fathomless gray eyes—share imagination with brown ones.

    The Madness of May Meredith Nicholson
  • What fathomless duplicity was hers, that she could appear so innocent.

    The Octopus Frank Norris
  • I seemed to be looking down into the depths of fathomless wells, within which was nothing but velvety darkness.

    A Volunteer with Pike Robert Ames Bennet
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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