tedium (n.)youdaoicibaDictYouDict[tedium 词源字典]
"tediousness," 1660s, from Latin taedium "weariness, irksomeness, disgust," related to taedet "it is wearisome, it excites loathing," and to taedere "to weary," of uncertain origin. Possible cognates are Old Church Slavonic težo, Lithuanian tingiu "to be dull, be listless."[tedium etymology, tedium origin, 英语词源]