Definition of "sketchily"

But, bowing with sketchily joined hands, they smiled their way clumsily out, down to the darkness.

1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 514

The Hunger Games has its share of standalone payoffs, though some are too sketchily developed to have much of an impact, like Katniss’ motherly connection to Rue.

22 March 2012, Scott Tobias, AV Club The Hunger Games