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unfathomable

[uhn-fath -uh-muh-buh l] /ʌnˈfæð ə mə bəl/
adjective
1.
not able to be fathomed, or completely understood; incomprehensible:
heroism in the face of unfathomable conflict.
2.
not able to be measured with a sounding line, or fathomed:
unfathomable depths of the ocean.
Related forms
unfathomableness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for unfathomable
Contemporary Examples
Historical Examples
  • And with her straight, unfathomable glance she answered that she would be so, of course.

    The Secret Agent Joseph Conrad
  • His eyes were dark, and they held an unfathomable melancholy.

    Tiverton Tales Alice Brown
  • As she turned to go her eyes thanked him with an unfathomable glance.

    The Black Bag Louis Joseph Vance
  • Is it pale and gray with heat, full of sunshine, and unfathomable in depth?

  • They had leant, so to say, one on the other above an unfathomable depth, attracted to it by its horror.

    Therese Raquin Emile Zola
British Dictionary definitions for unfathomable

unfathomable

/ʌnˈfæðəməbəl/
adjective
1.
incapable of being fathomed; immeasurable
2.
incomprehensible
Derived Forms
unfathomableness, noun
unfathomably, adverb
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 unfathomable
adj.

1610s, originally in the figurative sense, of feelings, conditions, etc., from un- (1) "not" + fathomable. Literal sense attested from 1670s. Related: Unfathomably.

Online Etymology Dictionary, © 2010 Douglas Harper
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