Source : Webster's Revised Unabridged Dictionary (1913)

Prudent \Pru"dent\, a. [L. prudens, -entis, contr. from
   providens: cf. F. prudent. See {Provident}.]
   1. Sagacious in adapting means to ends; circumspect in
      action, or in determining any line of conduct; practically
      wise; judicious; careful; discreet; sensible; -- opposed
      to {rash}; as, a prudent man; dictated or directed by
      prudence or wise forethought; evincing prudence; as,
      prudent behavior.

            Moses established a grave and prudent law. --Milton.

   2. Frugal; economical; not extravagant; as, a prudent woman;
      prudent expenditure of money.

   Syn: Cautious; wary; circumspect; considerate; discreet;
        judicious; provident; economical; frugal.

Source : WordNet®

prudent
     adj 1: careful and sensible; marked by sound judgment; "a prudent
            manager"; "prudent rulers"; "prudent hesitation";
            "more prudent to hide than to fight" [ant: {imprudent}]
     2: showing wise self-restraint in speech and behavior
        especially in preserving prudent silence; "maintained a
        prudent silence"