Iffy vs Sketchy - What's the difference?

In lang=en terms the difference between iffy and sketchy

is that iffy is of dubious authenticity, legitimacy or legality while sketchy is of questionable or doubtful quality.

(er)

(slang) Of dubious authenticity, legitimacy or legality.

He's selling new CD players for £20 each – that sounds a bit iffy to me.

Uncertain or chancy.

The weather is still iffy for Saturday's shuttle launch.

* (of dubious authenticity) dodgy, dubious, fishy * See also

(er)

Roughly or hastily laid out; intended for later refinement.

The first draft included a sketchy design.

Resembling a comedy sketch, of sketch quality.

(slang) Of questionable or doubtful quality.

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

(slang, 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.

(slang, 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.

* dicey * dodgy * seedy * shady