Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
maniac [ˈmeɪnɪæk] n (also fig) манья́к
he's a football maniac он стра́стный люби́тель футбо́ла
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: