impious
1. [ adjective ] (religion) lacking piety or reverence for a god
Related terms: pious godless wicked irreligious profane piety
2. [ adjective ] lacking due respect or dutifulness
Synonyms: undutiful
Examples:

"impious toward one's parents" "an undutiful son"

Related terms: disrespectful
3. [ adjective ] (religion) lacking piety and reverence for a god
Synonyms: ungodly
Related terms: irreligious
Similar spelling:   impiously
  impish
  impishly