definition of nonchalant
nonchalant. adjective indifferent, cool, calm, casual, detached, careless, laid-back (informal), airy, unconcerned, apathetic, dispassionate, unfazed (informal), unperturbed, blase, blasÃ©, offhand, unemotional, insouciant Imperturbable denis tried unsuccessfully to look nonchalant and. uninterested