absent-minded

Absent-minded \Ab`sent-mind"ed\, a.
   Absent in mind; abstracted; preoccupied. --
   {Ab`sent-mind"ed*ness}, n. -- {Ab`sent-mind"ed*ly}, adv.
   [1913 Webster]
    

63 Moby Thesaurus words for "absent-minded":
      Lethean, absent, absorbed, abstracted, amnestic, bemused, blocked,
      castle-building, converted, daydreaming, daydreamy, distracted,
      distrait, dreaming, dreamy, drowsing, ecstatic, elsewhere,
      engrossed, faraway, forgetful, forgetting, half-awake, heedless,
      in a reverie, in a trance, in the clouds, inadvertent, inattentive,
      inclined to forget, lost, lost in thought, meditative, mooning,
      moonraking, museful, musing, napping, nodding, oblivious, off,
      pensive, pipe-dreaming, preoccupied, rapt, repressed,
      somewhere else, stargazing, suppressed, taken up, transported,
      unaware, unconscious, unheedful, unheeding, unmindful, unnoticing,
      unobserving, unperceiving, unseeing, withdrawn, woolgathering,
      wrapped in thought