1. unconcerned (vs. concerned), blase, blithe, casual, insouciant, nonchalant, degage, detached, uninvolved, indifferent, careless, untroubled

usage: lacking in interest or care or feeling; "the average 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"

2. unconcerned, untroubled (vs. troubled)

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

3. unconcerned, uninvolved (vs. involved)

usage: not occupied or engaged with; "readers unconcerned with style"

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See also: unconcerned (Dictionary)