Source : Webster's Revised Unabridged Dictionary (1913)

Virtuous \Vir"tu*ous\ (?; 135), a. [OE. vertuous, OF. vertuos,
   vertuous, F. vertueux, fr. L. Virtuous. See {Virtue}, and cf.
   {Virtuoso}.]
   1. Possessing or exhibiting virtue. Specifically:
      (a) Exhibiting manly courage and strength; valorous;
          valiant; brave. [Obs.]

                Old Priam's son, amongst them all, was chiefly
                virtuous.                         --Chapman.
      (b) Having power or efficacy; powerfully operative;
          efficacious; potent. [Obs.] --Chaucer.

                Lifting up his virtuous staff on high, He smote
                the sea, which calm['e]d was with speed.
                                                  --Spenser.

                Every virtuous plant and healing herb. --Milton.
      (c) Having moral excellence; characterized by morality;
          upright; righteous; pure; as, a virtuous action.

                The virtuous mind that ever walks attended By a
                strong siding champion, conscience. --Milton.

   2. Chaste; pure; -- applied especially to women.

            Mistress Ford . . . the virtuous creature, that hath
            the jealous fool to her husband.      --Shak.
      -- {Vir"tu*ous*ly}, adv. -- {Vir"tu*ous*ness}, n.

Source : WordNet®

virtuous
     adj 1: of moral excellence; "a genuinely good person"; "a just
            cause"; "an upright and respectable man"; "the life of
            the nation is secure only while the nation is honest,
            truthful, and virtuous"- Frederick Douglass [syn: {good},
             {just}, {upright}]
     2: morally excellent [ant: {wicked}]
     3: behaving according to standards of what is right or just;
        "led a virtuous (or moral) life"
     4: in a state of sexual virginity; "pure and vestal modesty";
        "a spinster or virgin lady"; "men have decreed that their
        women must be pure and virginal" [syn: {pure}, {vestal}, {virgin},
         {virginal}]