unenthusiastic

unenthusiastic
    adj 1: not enthusiastic; lacking excitement or ardor; "an
           unenthusiastic performance by the orchestra";
           "unenthusiastic applause" [ant: {enthusiastic}]
    

41 Moby Thesaurus words for "unenthusiastic":
      apathetic, backward, balking, balky, blase, cold, cool, desireless,
      dilatory, grudging, halfhearted, inappetent, indifferent, laggard,
      loath, loveless, lukewarm, nirvanic, passionless, perfunctory,
      reluctant, renitent, restive, slow, slow to, un-come-at-able,
      unambitious, unapproachable, unaspiring, unattainable, unattracted,
      undesirous, uneager, unexcited, ungetatable, unimpressed,
      uninterested, unobtainable, unreachable, unresponsive, unzealous