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Synonyms
un·think·a·ble (ŭn-thĭnǵkə-bəl)

adjective 

  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.

derivatives

un·thinḱa·biĺi·ty
noun
un·thinḱa·bly
adverb