Source : Webster's Revised Unabridged Dictionary (1913)

Agile \Ag"ile\, a. [F. agile, L. agilis, fr. agere to move. See
   {Agent}.]
   Having the faculty of quick motion in the limbs; apt or ready
   to move; nimble; active; as, an agile boy; an agile tongue.

         Shaking it with agile hand.              --Cowper.

   Syn: Active; alert; nimble; brisk; lively; quick.

Source : WordNet®

agile
     adj 1: moving quickly and lightly; "sleek and agile as a gymnast";
            "as nimble as a deer"; "nimble fingers"; "quick of
            foot"; "the old dog was so spry it was halfway up the
            stairs before we could stop it" [syn: {nimble}, {quick},
             {spry}]
     2: mentally quick; "an agile mind"; "nimble wits" [syn: {nimble}]