asinine (adj.)youdaoicibaDictYouDict[asinine 词源字典]
c. 1600, "obstinate, stupid," from Latin asininus "stupid," literally "like an ass," from asinus "ass," also "dolt, blockhead" (see ass (n.1)). The literal sense in English is recorded from 1620s.[asinine etymology, asinine origin, 英语词源]