un·fath·om·a·ble

[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.

un·fath·om·a·ble·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
unfathomable (ʌnˈfæðəməbəl) [Click for IPA pronunciation guide]
 
adj
1.  incapable of being fathomed; immeasurable
2.  incomprehensible
 
un'fathomableness
 
n
 
un'fathomably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Unfathomable is always a great word to know.
So is flibbertigibbet. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
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
Her film camera stopped working, and the idea of no pictures for the rest of
  the trip was unfathomable.
Pick any year divisible by four, and chances are there will be unfathomable
  oddities.
His record of endurance at one school was unfathomable.
His comedy was typically extreme and sometimes unfathomable.
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