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fathomless

[fath -uh m-lis] /ˈfæð əm lɪs/
adjective
1.
impossible to measure the depth of; bottomless.
2.
impossible to understand; incomprehensible:
fathomless motives.
Origin of fathomless
1600-1610
1600-10; fathom + -less
Related forms
fathomlessly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for fathomless

fathomless

/ˈfæðəmlɪs/
adjective
1.
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
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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