Etymology
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impious (adj.)

1590s, "irreligious, lacking reverence for God," from Latin impius "without reverence, irreverent, wicked; undutiful, unpatriotic," from assimilated form of in- "not, opposite of" (see in- (1)) + pius (see pious). Related: Impiously; impiousness.

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Definitions of impious

impious (adj.)
lacking piety or reverence for a god;
impious (adj.)
lacking due respect or dutifulness;
impious toward one's parents
Synonyms: undutiful
From wordnet.princeton.edu