unfathomable

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un·fath·om·a·ble

 (ŭn-făth′ə-mə-bəl)
adj.
1. Difficult or impossible to understand; incomprehensible: unfathomable theories.
2. Difficult or impossible to measure: the unfathomable depths.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

unfathomable

(ʌnˈfæðəməbəl)
adj
1. incapable of being fathomed; immeasurable
2. incapable of being understood
unˈfathomableness n
unˈfathomably adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

un•fath•om•a•ble

(ʌnˈfæð ə mə bəl)
adj.
1. impossible to understand; incomprehensible.
2. incapable of being measured; limitless; vast.
[1615–20]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.unfathomable - of depthunfathomable - of depth; not capable of being sounded or measured
deep - having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination; "a deep well"; "a deep dive"; "deep water"; "a deep casserole"; "a deep gash"; "deep massage"; "deep pressure receptors in muscles"; "deep shelves"; "a deep closet"; "surrounded by a deep yard"; "hit the ball to deep center field"; "in deep space"; "waist-deep"
fathomable, plumbable, soundable - (of depth) capable of being sounded or measured for depth
2.unfathomable - resembling an abyss in depth; so deep as to be unmeasurable; "the abyssal depths of the ocean"
deep - having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination; "a deep well"; "a deep dive"; "deep water"; "a deep casserole"; "a deep gash"; "deep massage"; "deep pressure receptors in muscles"; "deep shelves"; "a deep closet"; "surrounded by a deep yard"; "hit the ball to deep center field"; "in deep space"; "waist-deep"
3.unfathomable - impossible to come to understandunfathomable - impossible to come to understand  
uncomprehensible, incomprehensible - difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

unfathomable

adjective
2. immeasurable, bottomless, unmeasured, unplumbed, unsounded Her eyes were black, unfathomable pools.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

unfathomable

adjective
Incapable of being grasped by the intellect or understanding:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations

unfathomable

[ʌnˈfæðəməbl] ADJinsondable
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

unfathomable

[ʌnˈfæðəməbəl] adj
(= inexplicable) [reason, mystery] → insondable
(= inscrutable) [person, expression, eyes] → insondable
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

unfathomable

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

unfathomable

[ʌnˈfæðəməbl] adj (depths, mystery) → insondabile, imperscrutabile; (person) → impenetrabile
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
Horrock there was certainly an apparent unfathomableness which offered play to the imagination.
The seemingly endless expansionary or associative potential of Yin-Yang led ancient sages to marvel at the "unfathomableness" of its operations (vol.
To me, American Fire is a book about arsons, but it's really a mystery about the unfathomableness of the human heart.