Antonyms for the phrase "over done" could include "underdone", "undercooked", or "rare". These terms describe food that has not been cooked thoroughly or has not been cooked enough to reach the desired level of doneness. Figuratively, other antonyms for "over done" could include "minimal", "moderate", or "restrained", meaning that something has been done with just the right amount of effort or intensity, without going too far or becoming excessive. These antonyms can be used to add variety to your writing or conversation, and to describe a range of different situations in which things might be done just right or done too much.