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