[adj] 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"
[adj] not occupied or engaged with; "readers unconcerned with style"
[adj] easy in mind; not worried; "the prisoner seems entirely unconcerned as to the outcome of the examination"