- impassive (adj.)
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[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]