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unthinkability

 - 3 dictionary results

un⋅think⋅a⋅ble

  [uhn-thing-kuh-buhl]
Use unthinkability in a Sentence
–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 ME; see un- 1 , thinkable

Related forms:
un⋅think⋅a⋅bil⋅i⋅ty, un⋅think⋅a⋅ble⋅ness, noun
un⋅think⋅a⋅bly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To unthinkability
un·think·a·ble   (ŭn-thĭng'kə-bəl)   
adj.  

  1. Impossible to imagine; inconceivable: an unthinkable amount of money.

  2. Contrary to what is plausible or probable: That this project would achieve ultimate success was unthinkable at the time.

  3. Not to be thought of or considered; out of the question: Raising taxes was politically unthinkable.

un·think'a·bil'i·ty, un·think'a·ble·ness n., un·think'a·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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