Source : Webster's Revised Unabridged Dictionary (1913)

Pious \Pi"ous\, a. [L. pius: cf. F. pieux.]
   1. Of or pertaining to piety; exhibiting piety; reverential;
      dutiful; religious; devout; godly. ``Pious hearts.''
      --Milton. ``Pious poetry.'' --Johnson.

            Where was the martial brother's pious care? --Pope.

   2. Practiced under the pretext of religion; prompted by
      mistaken piety; as, pious errors; pious frauds.

   Syn: Godly; devout; religious; righteous.

Source : WordNet®

pious
     adj 1: having or showing or expressing reverence for a deity;
            "pious readings" [ant: {impious}]
     2: devoutly religious; "a god-fearing and law-abiding people"
        H.L.Mencken [syn: {devout}, {god-fearing}]