impious
Concise Oxford English Dictionary © 2008 Oxford University Press:
impious /ˈɪmpɪəs, ɪmˈpʌɪəs/
▶adjective lacking piety or reverence.
■ wicked.
– derivatives
impiously adverb,
impiousness noun.
impiously adverb,
impiousness noun.
'impious' also found in these Oxford entries:

