stiffen (verb) stiffen: make or become harder
Sinonime: anneal, benumb,
brace,
cake,
candy,
cement,
chill, clot,
coagulate,
condense, congeal, crystallize, curdle,
firm,
fix,
freeze, gel, harden, inflate, inspissate, jell, jelly, ossify, petrify,
precipitate, prop,
reinforce,
set,
solidify,
stabilize, starch,
steady,
strengthen, tauten,
tense, thicken
Antonime: liquefy,
loosen,
melt