- not pious or religious; lacking reverence for God, religious practices, etc.; irreligious; ungodly.
- lacking piety or reverence for a god; ungodly
- lacking respect; undutiful
1590s, 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.