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'

easy in mind; not worried; the prisoner seems entirely unconcerned as to the outcome of the examination'

not occupied or engaged with; readers unconcerned with style'