perplexed (adj.)youdaoicibaDictYouDict[perplexed 词源字典]
late 15c., past participle adjective; see perplex. A case of a past participle form attested centuries before the verb (perplex isn't recorded until 17c.). Related: Perplexedly; perplexedness.[perplexed etymology, perplexed origin, 英语词源]