somnolent (adj.)youdaoicibaDictYouDict[somnolent 词源字典]
mid-15c., sompnolent, from Old French sompnolent (Modern French somnolent) or directly from Latin somnolentus "sleepy, drowsy," from somnus "sleep" (see Somnus). Respelled 17c. on Latin model.[somnolent etymology, somnolent origin, 英语词源]