Sprightliest

from The Collaborative International Dictionary of English v.0.48

Sprightly \Spright"ly\ (-l[y^]), a. [Compar. {Sprightlier}
   (-l[i^]*[~e]r); superl. {Sprightliest}.] [See {Sprite}.]
   Sprightlike, or spiritlike; lively; brisk; animated;
   vigorous; airy; gay; as, a sprightly youth; a sprightly air;
   a sprightly dance. "Sprightly wit and love inspires."
   --Dryden.
   [1913 Webster]

         The sprightly Sylvia trips along the green. --Pope.
   [1913 Webster]