Source : Webster's Revised Unabridged Dictionary (1913)

Sketchily \Sketch"i*ly\, adv.
   In a sketchy or incomplete manner. ``Sketchily descriptive.''
   --Bartlett.

Source : WordNet®

sketchily
     adv : in a sketchy incomplete manner; "he explained sketchily";
           "the dishes were only sketchily washed"