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[fath-uh m-lis]
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  1. impossible to measure the depth of; bottomless.
  2. impossible to understand; incomprehensible: fathomless motives.
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Origin of fathomless

First recorded in 1600–10; fathom + -less
Related formsfath·om·less·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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.

British Dictionary definitions for fathomless


  1. another word for unfathomable
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Derived Formsfathomlessly, adverbfathomlessness, 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

Word Origin and History for fathomless


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

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Online Etymology Dictionary, © 2010 Douglas Harper