Source : Webster's Revised Unabridged Dictionary (1913)

Sketchy \Sketch"y\, a.
   Containing only an outline or rough form; being in the manner
   of a sketch; incomplete.

         The execution is sketchy throughout; the head, in
         particular, is left in the rough.        --J. S.
                                                  Harford.

Source : WordNet®

sketchy
     adj : giving only major points; lacking completeness; "a sketchy
           account"; "details of the plan remain sketchy" [syn: {unelaborated}]
     [also: {sketchiest}, {sketchier}]