Etymology
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unthinkable (adj.)

early 15c., "too large to be conceived, unimaginable," from un- (1) "not" + think (v.) + -able. Meaning "incapable of being framed by thought" is recorded from mid-15c.

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Definitions of unthinkable

unthinkable (adj.)
incapable of being conceived or considered;
From wordnet.princeton.edu