Synonyms: casual, nonchalant, insouciant
Definition: marked by blithe unconcern
Usage: an ability to interest casual students; showed a casual disregard for cold weather; an utterly insouciant financial policy; an elegantly insouciant manner; drove his car with nonchalant abandon; was polite in a teasing nonchalant manner
Similar words: unconcerned
Definition: lacking in interest or care or feeling
Usage: the average American...is unconcerned that his or her plight is the result of a complex of personal and economic and governmental actions...beyond the normal citizen's comprehension and control; blithely unconcerned about his friend's plight