Rakish

Adjective: Having or displaying a dashing, jaunty, or slightly disreputable quality or appearance. Dashingly or sportingly stylish; jaunty. (esp. of a boat or car) Trim and fast-looking, with streamlined angles and curves. Synonyms: dashing, smart, sporty, flashy, breezy, jaunty, dapper While the interviewee lacked technical understanding, his outer appearance was so rakish that he appeared to be more of an expert than he really was.