chivalrous (adj.)youdaoicibaDictYouDict[chivalrous 词源字典]
mid-14c., from Old French chevaleros "knightly, noble, chivalrous," from chevalier (see chevalier; also compare chivalry). According to OED, obsolete in English and French from mid-16c. Not revived in French, but brought back in English late 18c. by romantic writers fond of medieval settings.[chivalrous etymology, chivalrous origin, 英语词源]