Unthinkability

unthinkable

[uhn-thing-kuh-buhl]
adjective
1.
inconceivable; unimaginable: the unthinkable size of the universe.
2.
not to be considered; out of the question: Such a suggestion is unthinkable.
noun
3.
something that cannot be conceived or imagined, as something too unusual, vague, or disagreeable: Today's unthinkables are tomorrow's realities.

Origin:
1400–50; late Middle English; see un-1, thinkable

unthinkability, unthinkableness, noun
unthinkably, adverb
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World English Dictionary
unthinkable (ʌnˈθɪŋkəbəl)
 
adj
1.  not to be contemplated; out of the question
2.  unimaginable; inconceivable
3.  unreasonable; improbable
 
unthinka'bility
 
n
 
un'thinkableness
 
n
 
un'thinkably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

unthinkable
1430, "too large to be conceived, unimaginable," from un- (1) "not" + thinkable (see think). Meaning "incapable of being framed by thought" is recorded from c.1445. Unthinking "unreflecting" is attested from 1676.
Online Etymology Dictionary, © 2010 Douglas Harper
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