What is the meaning of Sketchy?

Roughly or hastily laid out; intended for later refinement.

Not thorough or detailed.

Resembling a comedy sketch, of sketch quality. (Can we add an example for this sense?)

Of questionable or doubtful quality.

Suspected of taking part in illicit or dishonorable dealings.

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

Disturbing, or indicating possible danger.

Source: wiktionary.org