unconcerned

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"
    

Unconcerned \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.
   [1913 Webster]

         Happy mortals, unconcerned for more.     --Dryden.
   [1913 Webster]
    

77 Moby Thesaurus words for "unconcerned":
      Laodicean, Olympian, aloof, apathetic, ataractic, benumbed, blah,
      blase, bored, careless, casual, collected, comatose, composed,
      cool, degage, desensitized, detached, devil-may-care,
      disinterested, dispassionate, disregardful, distant, dull, easy,
      easygoing, free and easy, heartless, hebetudinous, heedless,
      hopeless, impassive, in a stupor, inattentive, incurious,
      indifferent, inexcitable, insouciant, lackadaisical, languid,
      lethargic, listless, mindless, negligent, nonchalant, numb, numbed,
      offhand, passive, perfunctory, phlegmatic, pluckless, pococurante,
      reckless, regardless, remote, resigned, slack, sluggish, soporific,
      spiritless, spunkless, stoic, stolid, stupefied, supine, torpid,
      turned-off, unanxious, uncaring, undiscriminating, uninquiring,
      uninterested, uninvolved, unmindful, unsolicitous, withdrawn