passionless

from WordNet (r) 3.0 (2006)

passionless
    adj 1: not passionate; "passionless observation of human nature"
           [ant: {passionate}]
    2: unmoved by feeling; "he kept his emotionless objectivity and
       faith in the cause he served"; "this passionless girl was
       like an icicle in the sunshine"-Margaret Deland [syn:
       {emotionless}, {passionless}]

from The Collaborative International Dictionary of English v.0.48

Passionless \Pas"sion*less\, a.
   Void of passion; without anger or emotion; not easily
   excited; calm. "Self-contained and passionless." --Tennyson.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

67 Moby Thesaurus words for "passionless":
      affectless, anesthetized, apathetic, arctic, autistic, blunt,
      catatonic, chill, chilly, cold, cold as charity, cold-blooded,
      coldhearted, cool, desireless, detached, dispassionate, drugged,
      dull, emotionally dead, emotionless, frigid, frosted, frosty,
      frozen, heartless, icy, immovable, impassible, impassive,
      inappetent, indifferent, inexcitable, inhibited, insusceptible,
      loveless, nirvanic, nonemotional, objective, obtuse, out of touch,
      self-absorbed, soulless, spiritless, unaffected, unaffectionate,
      unambitious, unaspiring, unattracted, uncaring, unconcerned,
      undersexed, undesirous, uneager, unemotional, unenthusiastic,
      unfeeling, unimpassioned, unimpressionable, unloving, unmoved,
      unpassionate, unresponding, unresponsive, unsusceptible,
      unsympathetic, untouchable