In the news, a courtroom artist was arrested today. I'm not surprised; he always seemed sketchy.

Behind the Groan

Sketchy by Profession

Sketchy can describe someone who seems suspicious or untrustworthy. A courtroom artist is also professionally sketchy because the job requires quick drawings of legal proceedings. Read the first sentence like a short news bulletin and make the reaction sound unsurprised. The occupational meaning quietly supports the suspicion without needing any details about the arrest.