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Synonyms for stiffen

verb

  1. To grow stiff

    jellify, gel, jelly, thicken, clot, coagulate, solidify, congeal, condense, set, curdle, freeze, inspissate, cake, chill, candy, crystallize; see also harden 2.

    Antonyms soften*, melt, liquefy.

  2. To cause to become stiff

    harden, benumb, anneal, starch, petrify, ossify, brace, prop, cement, fix, precipitate, evaporate, strengthen, invigorate, revive, bring to, inflate.

    Antonyms relax*, moisten, limber.

See stiffen in Webster's New World Roget's A-Z Thesaurus II

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