/ ˌkævəˈlɪə(r); NAmE -ˈlɪr/ adjective
[ usually before noun ] not caring enough about sth important or about the feelings of other people :
The government takes a cavalier attitude to the problems of prison overcrowding.
••
WORD ORIGIN
mid 16th cent.: from French , from Italian cavaliere , based on Latin caballus horse. Compare with Spanish caballero and French chevalier .