from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Impossible to imagine; inconceivable: an unthinkable amount of money.
  • adj. Contrary to what is plausible or probable: That this project would achieve ultimate success was unthinkable at the time.
  • adj. Not to be thought of or considered; out of the question: Raising taxes was politically unthinkable.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Incapable of being believed; incredible.
  • adj. Inconceivable or unimaginable; extremely improbable in a way that goes against common sense.

from The Century Dictionary and Cyclopedia

  • That cannot be made an object of thought; that cannot be thought; incogitable.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. incapable of being conceived or considered


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ thinkable



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