IMPASSIVE, IMPASSIVENESS
ADJECTIVES
► PO-FACED characterized by or assuming an expressionless or impassive face; hence, humourless, disapproving → c1900
► POKER-FACED without expression; showing a neutral mask; impassive → 1923 Amer. sl.
► STONY-FACED having an impassive, unfriendly and unyielding expression
NOUNS
► UNAFFECTEDNESS impassiveness, indifference → 1670 obs.
VERBS
► NOT BAT AN EYE to remain impassive → 1904 sl., orig. US
► NOT BAT AN EYELID to remain impassive → 1904 sl., orig. US
Lexicophilia 