unfathomable

[uhn-fath-uh-muh-buhl]
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.

unfathomableness, noun
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World English Dictionary
unfathomable (ʌnˈfæðəməbəl)
 
adj
1.  incapable of being fathomed; immeasurable
2.  incomprehensible
 
un'fathomableness
 
n
 
un'fathomably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unfathomable
1617, originally in the fig. sense, of feelings, conditions, etc., from un- (1) "not" + fathom (v.) + -able. Lit. sense attested from c.1676.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Without the full support of my parents such a feat was unfathomable.
Indeed, every great image has an unfathomable oneiric depth to which the
  personal past adds special color.
His record of endurance at one school was unfathomable.
All this creates is needless war and unfathomable debt.
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