2
refresh(verb, encourage, restore, revive, reassure)
2
reinvigorate(verb, revive, refresh)
2
restrain
2
rigid
2
secure(verb, calm, place, set, fix)
2
settle(verb, calm, close, set, fix)
2
shore up(verb, expression, support, increase, sustain)
2
square
2
stabilize(verb, calm, place, set, fix)
2
steady(verb, calm, place, set, fix)
2
stroke(verb, support, increase, keep, maintain)
2
vitrify(verb, close, set, fix, settle)
1
able
1
acclimate(verb, dull, close, set, develop)
1
acclimatize(verb, dull, close, set, develop)
1
accustom(verb, dull, develop, rough, adjust)
1
adapt(verb, dull, develop, rough, adjust)
1
add fuel to fire(verb, expression, idiom, support, increase)
1
add to(verb, expression, support, increase, sustain)
1
adjust(verb, dull, develop, rough, scratch)
11 years ago|7.2k views|share |citing 
APASmart Define. (2015). stiffen thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, stiffen thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>.
MLASmart Define. "stiffen thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms>