melancholic (adj.)youdaoicibaDictYouDict[melancholic 词源字典]
late 14c., from melancholy + -ic, or else from Late Latin melancholicus, from Greek melankholikos "choleric," from melankholia “sadness” (see melancholy). As a noun, from 1580s. Earlier adjective formation was melancholian (mid-14c.), and melancholiac (mid-19c.) also was tried.[melancholic etymology, melancholic origin, 英语词源]