Source : Webster's Revised Unabridged Dictionary (1913)

Purposeful \Pur"pose*ful\, a.
   Important; material. ``Purposeful accounts.'' --Tylor. --
   {Pur"pose*ful*ly}, adv.

Source : WordNet®

purposefully
     adv : in a purposeful manner; "he caught the motorcycles in the
           full glare of his headlights, braked and slipped
           purposefully out of the car"