pleasant (adj.)youdaoicibaDictYouDict[pleasant 词源字典]
late 14c. (early 14c. as a surname), from Old French plaisant "pleasant, pleasing, agreeable" (12c.), present participle of plaisir "to please" (see please). Pleasantry has the word's modern French sense of "funny, jocular." Related: Pleasantly.[pleasant etymology, pleasant origin, 英语词源]