1
brace up
1
bring up(verb, expression, keep, maintain, encourage)
1
brutalize(verb, dull, develop, rough, adjust)
1
build up(verb, expression, support, increase, sustain)
1
buoy up(verb, expression, keep, maintain, encourage)
1
calcify(verb, close, set, fix, settle)
1
callus(verb, dull, develop, rough, adjust)
1
care for(verb, expression, keep, maintain, encourage)
1
carry(verb, support, increase, sustain, uphold)
1
case-harden(verb, dull, develop, rough, adjust)
1
case harden
1
catch(verb, place, set, fix, secure)
1
chaperon(verb, keep, maintain, encourage, raise)
1
charge
1
cherish(verb, keep, maintain, encourage, raise)
1
chill to the bone(expression, idiom, bite, chill, nip)
1
clabber(set, swell, expand, freeze, thicken)
1
climatize(verb, dull, develop, rough, adjust)
1
coarsen(verb, dull, develop, rough, adjust)
1
cohere(form, set, develop, firm, freeze)
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>