lugubrious (adj.)youdaoicibaDictYouDict[lugubrious 词源字典]
c. 1600, from Latin lugubris "mournful, pertaining to mourning," from lugere "to mourn," from PIE root *leug- "to break; to cause pain" (cognates: Greek lygros "mournful, sad," Sanskrit rujati "breaks, torments," Lettish lauzit "to break the heart"). Related: Lugubriously; lugubriousness.[lugubrious etymology, lugubrious origin, 英语词源]