341 entries under verb topic. ×

6
cake(close, set, fix, settle)
6
tighten up(expression, phrasal verb)
5
crystallize(form, close, set, fix)
5
indurate(dull, close, set, fix)
5
ossify(calm, close, set, fix)
5
prop(noun, support, calm, fix)
5
rigidify(place, set, secure, settle)
5
steel(dull, close, set, fix)
5
temper(close, set, fix, settle)
4
consolidate(close, place, set, fix)
4
inspissate(swell, expand, condense, harden)
4
invigorate(encourage, restore, revive, refresh)
4
support(noun, calm, fix, increase)
3
back(keep, maintain, encourage, raise)
3
beef up(expression, phrasal verb, support, increase)
3
benumb(freeze, bite, chill, harden)
3
buttress(support, calm, close, set)
3
cement(close, place, set, fix)
3
energize(support, increase, encourage, restore)
3
gel(form, set, fix, develop)
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APASmart Define. (2015). stiffen thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, stiffen thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>.
MLASmart Define. "stiffen thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms>