sketchy

adjective

1. Roughly or hastily laid out; intended for later refinement.“The first draft included a sketchy design.”
2. Resembling a comedy sketch, of sketch quality.
3. Of questionable or doubtful quality.“The sketchy repair job did not look like it would hold.”
4. (of a person) Suspected of taking part in illicit or dishonorable dealings.“Because he is so sketchy, I always think that he is up to something.”