Qui ne se soucie pas ou pas assez. Insoucieux des conséquences de son acte.
1. Cheerfully irresponsible; SYN. devil-may-care, freewheeling, happy-go-lucky, harum-scarum, slaphappy.
2. Free of trouble and worry and care; SYN. unworried.
Airy; showy; hence, characterized by an affected or arrogant manner.
ETYM French, from non not (Latin non) + chaloir to concern one's self for, from Latin calere to be warm, to be inflamed with desire, to be troubled. Related to Non-, and Caldron.
Indifferent; careless; cool.
Having an air of easy unconcern or indifference.