Source : Webster's Revised Unabridged Dictionary (1913)

Peart \Peart\, a. [A variant of pert, a.]
   Active; lively; brisk; smart; -- often applied to
   convalescents; as, she is quite peart to-day. [O. Eng. &
   Colloq. U. S.]

         There was a tricksy girl, I wot, albeit clad in gray,
         As peart as bird, as straight as bolt, as fresh as
         flowers in May.                          --Warner
                                                  (1592).