Synonyms of harden in English:

harden


See US English definition of harden

See UK English definition of harden

See Spanish definition of endurecer

verb

1‘this glue will harden in four hours’

SYNONYMS
solidify, set, become hard, become solid, congeal, clot, coagulate, stiffen, thicken, cake, freeze, bake, crystallize
strengthen, reinforce
technical anneal, vulcanize, ossify, petrify
rare indurate, inspissate, gelatinize
ANTONYMS

liquefy

2‘their suffering had hardened them’

SYNONYMS
toughen, desensitize, inure, make insensitive, make tough, make unfeeling, case-harden, harden someone's heart
deaden, numb, benumb, anaesthetize
brutalize, make callous
rare indurate
ANTONYMS

soften