The Collaborative International Dictionary of English v.0.48:
Sketchily \Sketch"i*ly\, adv. In a sketchy or incomplete manner. "Sketchily descriptive." --Bartlett. [1913 Webster]WordNet (r) 3.0 (2006):
sketchily adv 1: in a sketchy incomplete manner; "he explained sketchily"; "the dishes were only sketchily washed"