maniac (adj.)youdaoicibaDictYouDict[maniac 词源字典]
c. 1600, "pertaining to mania; insane," from French maniaque (14c.), from Late Latin maniacus, from Greek maniakos, from mania (see mania). Borrowed at first in French form; Latinized in English from 1727. The noun is attested from 1763, from the adjective.[maniac etymology, maniac origin, 英语词源]