obsessive

from WordNet (r) 3.0 (2006)

obsessive
    adj 1: characterized by or constituting an obsession; "the
           obsessional character of his response"; "obsessive
           gambling" [syn: {obsessional}, {obsessive}]
    n 1: a person who has obsessions

from The Collaborative International Dictionary of English v.0.48

obsessional \obsessional\ obsessive \obsessive\adj.
   Persistently and abnormally preoccupied with some
   unreasonable idea.

   Syn: compulsive.
        [WordNet 1.5]

from Moby Thesaurus II by Grady Ward, 1.0

38 Moby Thesaurus words for "obsessive":
      absorbing, all-encompassing, arresting, attractive, compelling,
      compulsive, consuming, controlling, dominating, driving,
      enchanting, engaging, engrossing, enthralling, fascinating,
      gripping, harassing, haunting, holding, hypnotic, impelling,
      indelible, magnetic, mesmeric, mesmerizing, nagging, obsessing,
      obsessional, passionate, persistent, possessing, preoccupying,
      recurrent, spellbinding, tormenting, unforgettable, unshakable,
      unshakeable