tolerable (adj.)youdaoicibaDictYouDict[tolerable 词源字典]
early 15c., "bearable," from Middle French tolerable (14c.) and directly from Latin tolerabilis "that may be endured, supportable, passable," from tolerare "to tolerate" (see toleration). Meaning "moderate, middling, not bad" is recorded from 1540s. Related: Tolerably.[tolerable etymology, tolerable origin, 英语词源]