fa·cin·o·rous \fəˈsinərəs\adjective alsofac·i·ne·ri·ous\ˌfasəˈnirēəs\ Etymology: Latin facinorosus, facinerosus, from facinor-, facinus deed, evil deed, crime (from facere to do) + -osus -ous — more at do archaic: atrociously wicked : infamous • fa·cin·o·rous·nessnoun-esarchaic