Unthinkable Definition

ŭn-thĭngkə-bəl
adjective
Beyond the ability to understand or imagine; inconceivable.
Webster's New World
Not worth considering because of being socially unacceptable, too difficult, or too risky.
Raising taxes was politically unthinkable.
American Heritage
So extreme, foul, etc. as to be unfit to be imagined or considered.
Unthinkable war crimes.
Webster's New World
Abhorrent; monstrous.
Unthinkable brutality.
American Heritage

Incapable of being believed; incredible.

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