WordNet sense 1 (having undergone oxidation):

burnt

WordNet sense 2 (subjected to a physical (or chemical) treatment or action or agent):

treated

WordNet sense 3 (hardened by subjecting to intense heat):

baked

WordNet sense 4 (made hard or flexible or resilient especially by heat treatment):

tempered, hardened, toughened

WordNet sense 5 (usually used of physical or mental injury to persons):

injured

WordNet sense 6 (destroyed or badly damaged by fire):

burned-out, burnt-out, burned-over

WordNet sense 7 (spoiled or ruined or demolished):

destroyed

WordNet sense 8 (having been prepared for eating by the application of heat):

cooked