Spry

Spry (?), a. [Compar. Sprier or Spryer (?); superl. Spriest or Spryest.] [Cf. dial. Sw. sprygg lively, skittish, and E. sprag.] Having great power of leaping or running; nimble; active. [U.S. & Local Eng.]

She is as spry as a cricket.
S. Judd (Margaret).

If I'm not so large as you,
You are not so small as I,
And not half so spry.
Emerson.