stagnant (adj.)youdaoicibaDictYouDict[stagnant 词源字典]
1660s, from French stagnant (early 17c.), from Latin stagnantem (nominative stagnans), present participle of stagnare "to stagnate" (see stagnate). Related: Stagnancy (1650s); stagnantly.[stagnant etymology, stagnant origin, 英语词源]