blase

adjectives

very sophisticated especially because of surfeit; versed in the ways of the world
"the blase traveler refers to the ocean he has crossed as `the pond'"; "the benefits of his worldly wisdom"
uninterested because of frequent exposure or indulgence
"his blase indifference"; "a petulant blase air"; "the bored gaze of the successful film star"
nonchalantly unconcerned
"a blase attitude about housecleaning"
is similar to
lacking in interest or care or feeling
"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"