https://www.merriam-webster.com/thesaurus/impassiveness
IMPASSIVENESS Synonyms: 50 Similar and Opposite Words | Merriam-Webster Thesaurus
Synonyms for IMPASSIVENESS: impassivity, numbness, apathy, emptiness, phlegm, emotionlessness, insensibility, coldness; Antonyms of IMPASSIVENESS: emotion,...
opposite wordsmerriam webstersynonymssimilarthesaurus