complaisantyoudaoicibaDictYouDict[complaisant 词源字典]
complaisant: [17] Complaisant and complacent [17] are virtual doublets. Both come from Latin complacēre ‘please greatly’ (a compound verb formed from placēre, source of English please), but they reached English along different routes. Complaisant came via French, from complaisant, the present participle of complaire ‘gratify’, but complacent was a direct borrowing from the Latin present participle. It originally meant simply ‘pleasant, delightful’, and did not take on its present derogatory connotations (at first expressed by the now obsolete complacential) until the mid 18th century.
=> complacent, please[complaisant etymology, complaisant origin, 英语词源]
complaisant (adj.)youdaoicibaDictYouDict
1640s, from French complaisant (16c.), in Middle French, "pleasing," present participle of complaire "acquiesce to please," from Latin complacere "be very pleasing" (see complacent, with which it overlapped till mid-19c.). Possibly influenced in French by Old French plaire "gratify."