• synonyms


[fath-uh m-lis]
See more synonyms for fathomless on Thesaurus.com
  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

Related Words for fathomless

unimaginable, unintelligible, puzzling, impenetrable, opaque, unfathomable, baffling, mystifying, inconceivable, deep, illegible, incomprehensible, meaningless, indecipherable, vague, wide, rooted, profound, far, broad

Examples from the Web for fathomless

Contemporary Examples of fathomless

Historical Examples of fathomless

  • 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