com·pul·sive 
(kəm-pŭlsĭv)
(kəm-pŭlsĭv)adj.
1. Having the capacity to compel: a frightening, compulsive novel.
2. Psychology Caused or conditioned by compulsion or obsession.
n.
A person with behavior patterns governed by a compulsion.
com·pulsive·ly adv.
com·pulsive·ness, com′pul·sivi·ty (kŏm′pŭl-sĭvĭ-tē, kəm-) n.