107 entries under set topic. ×

20
harden(verb, form, support, close, place)
20
solidify(verb, form, close, place)
17
congeal(verb, form, close, place)
15
thicken(verb, form, close, place)
13
jell(verb, close, fix, settle)
10
freeze(verb, form, calm, close)
10
strengthen(verb, support, dull, close)
10
brace(noun, verb, calm, close)
10
fortify(verb, support, close, fix)
9
coagulate(verb, form, close, fix)
9
reinforce(verb, support, close, fix)
9
toughen(verb, support, close, fix)
7
clot(verb, form, close, fix)
7
firm(verb, calm, close, fix)
7
fix(verb, calm, close, secure)
6
cake(verb, close, fix, settle)
5
crystallize(verb, form, close, fix)
5
indurate(verb, dull, close, fix)
5
ossify(verb, calm, close, fix)
5
rigidify(verb, place, secure, settle)
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APASmart Define. (2015). stiffen thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, stiffen thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>.
MLASmart Define. "stiffen thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms>