im·pi·ous /ˈɪmpiəs, (ˌ)ɪmˈpaɪ-/
  (a.)無信仰的,不敬神的,不虔誠的,不孝的
  Im·pi·ous a.  Not pious; wanting piety; irreligious; irreverent; ungodly; profane; wanting in reverence for the Supreme Being; as, an impious deed; impious language.
  When vice prevails, and impious men bear away,
  The post of honor is a private station.   --Addison.
  Syn: -- Impious, Irreligious, Profane.
  Usage: Irreligious is negative, impious and profane are positive. An indifferent man may be irreligious; a profane man is irreverent in speech and conduct; an impious man is wickedly and boldly defiant in the strongest sense. Profane also has the milder sense of secular.
  -- Im*pi*ous*ly, adv. -- Im*pi*ous*ness, n.
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  impious
       adj 1: lacking piety or reverence for a god [ant: pious]
       2: lacking due respect or dutifulness; "impious toward one's
          parents"; "an undutiful son" [syn: undutiful]
       3: lacking piety and reverence for a god [syn: ungodly]