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1. Lacking reverence; not pious.
2. Lacking due respect or dutifulness: impious toward one's parents.
[From Latin impius : in-, not; see in-1 + pius, dutiful.]
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|Noun||1.||impiousness - unrighteousness by virtue of lacking respect for a god|
unrighteousness - failure to adhere to moral principles; "forgave us our sins and cleansed us of all unrighteousness"
undutifulness - impiety characterized by lack of devotion to duty