sketchy

adjective

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

  "The first draft included a sketchy design."

• Resembling a comedy sketch, of sketch quality.
• Of questionable or doubtful quality.

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

• (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."

• (of a person) Disturbing or unnerving, often in such a way that others may suspect them of intending physical or sexual harm or harassment.

  "Jack is so sketchy. I think he's stalking me."