impious

1. Lacking piety or reverence for a god (synset 301787064)
   also:

   • irreligious - hostile or indifferent to religion
   • profane, secular - not concerned with or devoted to religion
   • wicked - morally bad in principle or practice
   tells us about: piety, piousness - righteousness by virtue of being pious
   similar to: godless, irreverent - not revering god
2. Lacking due respect or dutifulness (synset 302002963)
   "impious toward one's parents"; "an undutiful son"
   similar to: disrespectful - exhibiting lack of respect; rude and discourteous
   same as: undutiful

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