American English

Definition of unthinkable adjective from the Oxford Advanced American Dictionary



    unthinkable (for somebody) (to do something) unthinkable (that…)
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  1. 1impossible to imagine or accept synonym inconceivable
  2. 2 It was unthinkable that she could be dead. opposite thinkable
the unthinkable
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noun [singular] Suddenly the unthinkable happened and he pulled out a gun. The time has come to think the unthinkable (= consider possibilities that used to be unacceptable).
See the Oxford Advanced Learner's Dictionary entry: unthinkable