Isn't arrogance by definition an overestimation of one's abilities? Therefore it makes them at least overconfident. If they engage their enemy overconfident and at the same time they underestimate their enemy, then "stupid" comes into play.
==Notable–
Sauce
https://www.politico.com/news/2020/11/23/dianne-feinstein-step-down-senate-judiciary-439836