1
bind(verb, set, fix, develop, secure)
1
blend(verb, meet, develop, secure, join)
1
blot(verb, dry, exhaust, drain, empty)
1
bolster(verb, support, increase, establish, extend)
1
boost(verb, support, increase, sustain, uphold)
1
brace up
1
brainwash(verb, study, develop, improve, prepare)
1
brand(dry, burn, blight, scorch, solder)
1
break
1
brown(dry, burn, blight, scorch, solder)
1
burn up(expression, burn, brand, blight, scorch)
1
candy(verb, strengthen, steady, reinforce, thicken)
1
care for(verb, expression, study, develop, improve)
1
carry(verb, support, increase, boost, sustain)
1
case-harden(verb, calcify, thicken, stabilize, toughen)
1
catch(verb, place, set, fix, secure)
1
cauterize(dry, burn, brand, blight, scorch)
1
centralize(develop, secure, join, unite, combine)
1
chill(verb, set, strengthen, steady, freeze)
1
chill to the bone(expression, idiom, bite, chill, nip)
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APASmart Define. (2016). harden thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/harden/thesaurus/synonyms
ChicagoSmart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, harden thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>.
MLASmart Define. "harden thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/harden/thesaurus/synonyms>