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impassive (adj.)
[impassive 词源字典]
1660s, "not feeling pain," from assimilated form of
in-
"not, opposite of" (see
in-
(1)) +
passive
. Meaning "void of emotions" is from 1690s. Related:
Impassively
;
impassiveness
(1640s).
[impassive etymology, impassive origin, 英语词源]