Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
compulsive [kəmˈpʌlsɪv] adj (gambler etc) безрассу́дный; (behaviour) маниака́льный; (reading etc) захва́тывающий*захва́тывающ
he's a compulsive liar он неисправи́мый лгун
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.