unthinkable

[ uhn-thing-kuh-buh l ]
/ ʌnˈθɪŋ kə bəl /

adjective

inconceivable; unimaginable: the unthinkable size of the universe.
not to be considered; out of the question: Such a suggestion is unthinkable.

noun

something that cannot be conceived or imagined, as something too unusual, vague, or disagreeable: Today's unthinkables are tomorrow's realities.

Nearby words

  1. untethered,
  2. unthankful,
  3. unthatch,
  4. unthaw,
  5. unthink,
  6. unthinking,
  7. unthought,
  8. unthought-of,
  9. unthread,
  10. unthrifty

Origin of unthinkable

late Middle English word dating back to 1400–50; see origin at un-1, thinkable

Related formsun·think·a·bil·i·ty, un·think·a·ble·ness, nounun·think·a·bly, adverb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unthinkable


British Dictionary definitions for unthinkable

unthinkable

/ (ʌnˈθɪŋkəbəl) /

adjective

not to be contemplated; out of the question
unimaginable; inconceivable
unreasonable; improbable
Derived Formsunthinkability or unthinkableness, noununthinkably, 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

Word Origin and History for unthinkable

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