55 entries under close topic. ×

5
steel(verb, dull, set, fix)
5
temper(verb, set, fix, settle)
4
consolidate(verb, place, set, fix)
3
buttress(verb, support, calm, set)
3
cement(verb, place, set, fix)
3
nerve(verb, set, fix, settle)
3
petrify(verb, set, fix, settle)
3
starch(verb, set, fix, settle)
2
callous(verb, dull, set, fix)
2
curdle(verb, set, fix, settle)
2
gird(verb, set, fix, settle)
2
precipitate(verb, set, fix, settle)
2
settle(verb, calm, set, fix)
2
vitrify(verb, set, fix, settle)
1
acclimate(verb, dull, set, develop)
1
acclimatize(verb, dull, set, develop)
1
amalgamate(verb, set, fix, settle)
1
anneal(verb, set, fix, settle)
1
bake(verb, set, fix, settle)
1
calcify(verb, set, fix, 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>