Something like “RebYidd23 is intelligent and able. If only he wasn’t so obnoxious and rude, I would be glad he’s in this class.”
Or “RebYidd23 is very intelligent but has never yet written any answers to anything related to math. He often reads, draws, or writes poetry instead of participating, and is also very disrespectful. With improvement, he can be a great asset to our class.”