irreprehensible (adj.)youdaoicibaDictYouDict[irreprehensible 词源字典]
late 14c., from Late Latin irreprehensibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + reprehens-, past participle stem of reprehendere (see reprehend).[irreprehensible etymology, irreprehensible origin, 英语词源]