stiffenverbHow many syllables in stiffen?There are 2 syllables in the word stiffen.See more 2-syllable verbsHow to pronounce stiffen:Say stiffenDefinition of stiffen:stiffen (verb):become stiff or stiffer.to make stiff or stifferto make or become stiff or stifferSynonyms for stiffen:coagulatesolidifycongealhardensetcrystallizegelstrengthenOther 2-syllable words like stiffenHere are some other common words that have 2 syllables, like stiffen does.costumesnickedpassivecarnagesendercherriespotentRahnicatfishpluralspurringburiedpillagedpenniesquiterhydrantgraziesuperflashlightbreak upbelikefendergoldfishvegasfangle