What is another word for "harden"?

Roget's Thesaurus (1911) lists these synonyms for "harden": adamant, adamantean, adamantine, against, alienate, alienation, and, animosity, arms, bad, bear, benefit, bitterness, block, board, bone, bony, brick, buckram, but, calculous, callosity, cartilage, cartilaginous, cast, cement, clergy, cold, concrete, conscience, contrition, cool, corneous, crag, crystal, crystallization, deal, die, disaffected, discord.