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 (ĭm-pī′əs, ĭm′pē-)
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.]

im′pi·ous·ly adv.
im′pi·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
irreligion, irreligiousness - the quality of not being devout
ungodliness, godlessness - impiety by virtue of not being a godly person
References in classic literature ?
Not only that, but the subtle insanity of Ahab respecting Moby Dick was noways more significantly manifested than in his superlative sense and shrewdness in foreseeing that, for the present, the hunt should in some way be stripped of that strange imaginative impiousness which naturally invested it; that the full terror of the voyage must be kept withdrawn into the obscure background (for few men's courage is proof against protracted meditation unrelieved by action); that when they stood their long night watches, his officers and men must have some nearer things to think of than Moby Dick.
5) Contrast this to a younger Hawthorne's perspective on ambition in The Spectator: "The impiousness of [Satan's] design of making himself master of the Heavens, is forgotten by the reader, in contemplation of the daring ambition which impelled him to such a project, and pity for his sufferings takes the place of hatred for his crimes" (23:51-52).
In this painting," wrote a church secretary, referring to the painting "Death of the Virgin, "there are but vulgarity, sacrilege, impiousness and disgust.