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impassive (adj.)

1660s, "not feeling pain, insen" from assimilated form of in- "not, opposite of" (see in- (1)) + passive. Meaning "void of emotions, unmoved" is from 1690s. Related: Impassively; impassiveness (1640s).

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Definitions of impassive from WordNet

impassive (adj.)
having or revealing little emotion or sensibility; not easily aroused or excited; "he remained impassive, showing neither interest in nor concern for our plight"- Nordhoff & Hall; "a silent stolid creature who took it all as a matter of course"-Virginia Woolf;
her impassive remoteness
Synonyms: stolid
impassive (adj.)
deliberately impassive in manner;
Synonyms: deadpan / expressionless / poker-faced / unexpressive
From wordnet.princeton.edu