subservient (adj.)youdaoicibaDictYouDict[subservient 词源字典]
1630s, "useful, serviceable," from Latin subservientem (nominative subserviens), present participle of subservire "assist, serve, come to the help of, lend support," from sub "under" (see sub-) + servire "serve" (see serve (v.)). The meaning "slavishly obedient" is first recorded 1794. Related: Subserviently.[subservient etymology, subservient origin, 英语词源]