impassiveness n apathy demonstrated by an absence of emotional reactions Usage(s) His impassiveness only seemed to encourage the crowd further. The figures at Asia Housewhether gods, or dancing girls, or Buddha himselfare masterpieces of impassiveness, each face a study in noble calm. In their impassiveness they resembled Indians at a pow-wow with white men. Synonym(s) emotionlessness impassivity phlegm indifference stolidity unemotionality