英语词源字典 - 在线词源网站

colorless (adj.)[colorless 词源字典]: late 14c., from color (n.) + -less. Figurative sense of "lacking vividness" is recorded from 1861. Related: Colorlessness.[colorless etymology, colorless origin, 英语词源]
wan (adj.): Old English wann "dark, dusky, lacking luster," later "leaden, pale, gray," of uncertain origin, and not found in other Germanic languages. The connecting notion is colorlessness. Perhaps related to wane. Related: Wanly; wanness.