half-burnt; half-done; half-baked; rare
Describes something that is only partially cooked, burnt, or completed. The 'rare' gloss refers to undercooked food, not rarity.
This bread is half-baked and still raw inside.
You shouldn't eat half-cooked meat.
Compound of 半 (half) and 焼け (baking, burning), the nominalized stem of 焼ける (to be baked/burnt).