Definition of unthinkable

Reference

un·think·a·ble

(

n-th

-b

l) KEY

ADJECTIVE:

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

OTHER FORMS:
un·thinka·bili·ty or un·thinka·ble·ness(Noun), un·thinka·bly(Adverb)

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