From Longman Dictionary of Contemporary Englishimpiousim‧pi‧ous /ˈɪmpiəs/ adjective formal RELIGIONlacking respect for religion or God → impiety an impious crime —impiously adverb —impiousness noun [uncountable]
Examples from the Corpus
impious• This impious crime, wrote Ammianus, for ever stained the reign of Constantius.• And I have heard a name given already to the impious thief who dared disturb her.• In that case it would be impious to consult the Oracle.• Ramsey, so shamefully plundered and denuded by impious villains?• Change was popularly associated with the impious ways of foreign heretics. 