insensitive

insensitive
    adj 1: not responsive to physical stimuli; "insensitive to
           radiation" [ant: {sensitive}]
    2: deficient in human sensibility; not mentally or morally
       sensitive; "insensitive to the needs of the patients" [ant:
       {sensitive}]
    

Insensitive \In*sen"si*tive\, a.
   Not sensitive; wanting sensation, or wanting acute
   sensibility. --Tillotson. --Ruskin.
   [1913 Webster]
    

103 Moby Thesaurus words for "insensitive":
      Philistine, aloof, anesthetic, anesthetized, asleep, benumbed,
      blanket, bloodless, boorish, caddish, callous, calloused,
      case-hardened, casual, coarse, cold, cold of heart, coldblooded,
      coldhearted, crude, dead, deadened, dull, flinthearted, flinty,
      general, hard, hard of heart, hardened, hardhearted, heartless,
      ill-bred, impassible, impassive, imperceptive, impercipient,
      impervious, imprudent, inconsiderate, incurious, indifferent,
      indiscreet, indiscriminate, indiscriminative, indurated, insensate,
      insensible, insentient, inured, loutish, louty, nasty,
      nonjudgmental, numb, numbed, obdurate, obtuse, offensive,
      pachydermatous, promiscuous, proof against, rocky, senseless,
      steeled against, steely, stony, stonyhearted, tactless,
      thick-skinned, thick-witted, unconcerned, uncritical,
      uncriticizing, undemanding, undifferentiating, undiscreet,
      undiscriminating, undiscriminative, unexacting, unfastidious,
      unfeeling, unfelt, unfeminine, ungenteel, ungentle, ungentlemanly,
      unimpressible, unimpressionable, unladylike, unmerciful,
      unmeticulous, unnatural, unparticular, unperceptive, unrefined,
      unresponsive, unselective, unsolicitous, unsubtle, unsusceptible,
      untactful, vulgar, wholesale