unconcerned
/ˌən-kən-ˈsərnd/
adjective
not anxious or upset : free of worry
not involved : not having any part or interest
indifferent unconcerned incurious aloof detached disinterested mean not showing or feeling interest. indifferent implies neutrality of attitude from lack of inclination, preference, or prejudice. unconcerned suggests a lack of sensitivity or regard for others' needs or troubles.