127 entries under set topic. ×

22
solidify(verb, form, close, place)
20
congeal(verb, form, close, place)
20
stiffen(verb, form, support, close, place)
17
strengthen(verb, support, close, meet)
16
thicken(verb, form, close, place)
15
coagulate(verb, form, close, develop)
14
brace(noun, verb, support, close)
14
indurate(verb, adjective, close, settle)
13
cake(noun, verb, close, settle)
12
fortify(verb, support, close, strong)
12
freeze(verb, form, close, develop)
12
jell(verb, close, settle, firm)
12
reinforce(verb, support, close, increase)
12
season(noun, verb, study, close)
12
temper(noun, verb, close, settle)
12
toughen(verb, support, close, increase)
11
ossify(verb, close, hard, settle)
9
consolidate(verb, support, close, place)
9
fix(verb, close, secure, settle)
9
petrify(verb, close, hard, settle)
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APASmart Define. (2016). harden thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/harden/thesaurus/synonyms
ChicagoSmart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, harden thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>.
MLASmart Define. "harden thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/harden/thesaurus/synonyms>