Sketchy

Adjective

1. Roughly or hastily laid out; intended for later refinement.

   "The first draft included a sketchy design."

2. Not thorough or detailed.
3. Resembling a comedy sketch, of sketch quality. (Can we add an example for this sense?)
4. Of questionable or doubtful quality.

   "The sketchy repair job did not look like it would hold."

5. Suspected of taking part in illicit or dishonorable dealings.

   "Because he is so sketchy, I always think that he is up to something."