Source : Webster's Revised Unabridged Dictionary (1913)

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

         Religion is . . . inconsistent with all compulsive
         motives.                                 --Sharp.

Source : WordNet®

compulsive
     adj 1: caused by or suggestive of psychological compulsion;
            "compulsive drinking"
     2: strongly motivated to succeed [syn: {determined}, {driven}]

compulsive
     n : a person with a compulsive disposition; someone who feels
         compelled to do certain things