un·con·cerned /-ˈsɝnd/
  (a.)不關心的
  Un·con·cerned a. Not concerned; not anxious or solicitous; easy in mind; carelessly secure; indifferent; as, to be unconcerned at what has happened; to be unconcerned about the future. -- Un*con*cern*ed*ly adv. -- Un*con*cern*ed*ness, n.
     Happy mortals, unconcerned for more.   --Dryden.
  ◄ ►
  unconcerned
       adj 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" [ant: concerned]
       2: easy in mind; not worried; "the prisoner seems entirely
          unconcerned as to the outcome of the examination"
       3: not occupied or engaged with; "readers unconcerned with
          style"