sketch·y 
(skĕchē)
(skĕchē)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.
sketchi·ly adv.
sketchi·ness n.