341 entries under verb topic. ×

3
nerve(close, set, fix, settle)
3
petrify(close, set, fix, settle)
3
starch(close, set, fix, settle)
3
sustain(support, calm, fix, increase)
2
callous(dull, close, set, fix)
2
candy(harden, jellied, thicken, solidify)
2
chill(set, freeze, harden, thicken)
2
close(set, fix, settle, firm)
2
condense(form, set, fix, develop)
2
confirm(encourage, restore, revive, refresh)
2
curdle(close, set, fix, settle)
2
fasten(calm, place, set, fix)
2
gird(close, set, fix, settle)
2
increase(support, sustain, uphold, strengthen)
2
intensify
2
numb(dull, develop, rough, adjust)
2
precipitate(close, set, fix, settle)
2
refresh(encourage, restore, revive, reassure)
2
reinvigorate(revive, refresh)
2
restrain
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APASmart Define. (2015). stiffen thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, stiffen thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>.
MLASmart Define. "stiffen thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms>