in·con·ceiv·a·ble

[in-kuhn-see-vuh-buhl]
adjective
1.
not conceivable; unimaginable; unthinkable
2.
unbelievable; incredible.

Origin:
1625–35; in-3 + conceivable

in·con·ceiv·a·bil·i·ty, in·con·ceiv·a·ble·ness, noun
in·con·ceiv·a·bly, adverb
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World English Dictionary
inconceivable (ˌɪnkənˈsiːvəbəl) [Click for IPA pronunciation guide]
 
adj
incapable of being conceived, imagined, or considered
 
inconceiva'bility
 
n
 
incon'ceivableness
 
n
 
incon'ceivably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Inconceivable is always a great word to know.
So is interrobang. Does it mean:
the offspring of a zebra and a donkey.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

inconceivable
1631, from in- "not" + conceivable (see conceive).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Watching at all was an act so unseemly as to be inconceivable among gentlemen
  in their day.
It is inconceivable that the public ignores these warnings.
It's not inconceivable that there are forms of life that thrive under those
  conditions.
Since ethical norms vary from country to country, it is inconceivable that no
  one will try this.
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