The Collaborative International Dictionary of English v.0.48:

Compulsive \Com*pul"sive\, a.
   Having power to compel; exercising or applying compulsion.
   [1913 Webster]

         Religion is . . . inconsistent with all compulsive
         motives.                                 --Sharp.
   [1913 Webster]

WordNet (r) 3.0 (2006):

compulsive
    adj 1: caused by or suggestive of psychological compulsion;
           "compulsive drinking"
    2: strongly motivated to succeed [syn: compulsive,
       determined, driven]
    n 1: a person with a compulsive disposition; someone who feels
         compelled to do certain things

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "compulsive":
   accordant, anal, automatic, blind, bourgeois, coactive, coercive,
   compelling, compulsatory, compulsory, concordant, conditioned,
   conformist, constrained, constraining, conventional, corresponding,
   driving, forced, forceful, formalistic, gripping, harmonious,
   holding, impelling, imperative, imperious, impulsive, in accord,
   in keeping, in line, in step, instinctive, involuntary,
   irresistible, kosher, mechanical, obsessing, obsessional,
   obsessive, orthodox, overwhelming, pedantic, plastic, possessing,
   precisianistic, preoccupying, pressing, reflex, reflexive,
   restraining, square, straight, stuffy, traditionalist, unconscious,
   unintentional, unthinking, unwilled, unwilling, unwitting, uptight,
   urgent