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unthinkable (adj.)
[unthinkable 词源字典]
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.
[unthinkable etymology, unthinkable origin, 英语词源]