Synonyms of nonchalance in English:

nonchalance


See definition of nonchalance

noun

1‘she shrugged, feigning nonchalance’

SYNONYMS
calmness, coolness, insouciance, unconcern, casualness, airiness, sangfroid, calm, indifference, dispassionateness, lack of emotion, composure, detachment, imperturbability
informal one's cool
ANTONYMS

anxiety, concern