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unthinkable

[uhn-thing-kuh-buh l] /ʌnˈθɪŋ kə bəl/
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 of unthinkable
late Middle English
1400-1450
late Middle English word dating back to 1400-50; See origin at un-1, thinkable
Related forms
unthinkability, unthinkableness, noun
unthinkably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for unthinkable

unthinkable

/ʌnˈθɪŋkəbəl/
adjective
1.
not to be contemplated; out of the question
2.
unimaginable; inconceivable
3.
unreasonable; improbable
Derived Forms
unthinkability, unthinkableness, noun
unthinkably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unthinkable
adj.

early 15c., "too large to be conceived, unimaginable," from un- (1) "not" + thinkable (see think). Meaning "incapable of being framed by thought" is recorded from mid-15c.

Online Etymology Dictionary, © 2010 Douglas Harper
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