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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. 2014.
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British Dictionary definitions for un-fathomable

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 un-fathomable

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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