atrocious (adj.)youdaoicibaDictYouDict[atrocious 词源字典]
1660s, from stem of Latin atrox "fierce, savage, cruel" (see atrocity) + -ous. Colloquial sense "very bad" is late 19c. Related: Atrociously; atrociousness.[atrocious etymology, atrocious origin, 英语词源]