1. 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

Similar word(s): careless, blase, blithe, casual, insouciant, nonchalant, degage, detached, uninvolved, indifferent, untroubled

2. easy in mind; not worried

- the prisoner seems entirely unconcerned as to the outcome of the examination

Similar word(s): untroubled

3. not occupied or engaged with

- readers unconcerned with style

Similar word(s): uninvolved