The Collaborative International Dictionary of English v.0.48:

Fleet \Fleet\, a. [Compar. Fleeter; superl. Fleetest.] [Cf.
   Icel. flj[=o]tr quick. See Fleet, v. i.]
   1. Swift in motion; moving with velocity; light and quick in
      going from place to place; nimble.
      [1913 Webster]

            In mail their horses clad, yet fleet and strong.
                                                  --Milton.
      [1913 Webster]

   2. Light; superficially thin; not penetrating deep, as soil.
      [Prov. Eng.] --Mortimer.
      [1913 Webster]