adj. sketch·i·er,
sketch·i·est 1. Resembling a sketch; drawn with little detail: a sketchy map.
2. Missing important points or lacking in detail; not thorough: sketchy evidence; sketchy memories.
3. Informal a. Of questionable authenticity or trustworthiness: a sketchy accent; a sketchy character.
b. Of dubious safety; potentially harmful or dangerous: a sketchy neighborhood.