Definition of "sketchy"

sketchy

/ˈskɛt͡ʃi/

adjective
comparative sketchier, superlative sketchiest
1. Roughly or hastily laid out; intended for later refinement.
2. Not thorough or detailed.
  Quotations
  This is still in the design stage, so details are sketchy.
  2021 August 11, Paul Bigland, “Where HS2 will meet EWR”, in RAIL, number 937, page 39
3. Resembling a comedy sketch, of sketch quality.
4. (Canada, US, slang) Of questionable or doubtful quality.
5. (Canada, US, slang, of a person) Suspected of taking part in illicit or dishonorable dealings.
  Quotations
  The downside of working with sketchy dudes on building sites and in greasy spoons was that they were sketchy, but they also knew shady things.
  2019, Colson Whitehead, The Nickel Boys, Fleet, page 201
6. (Canada, US, 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.