1
give a leg up(verb, expression, idiom, keep, maintain)
1
glaciate(freeze, bite, chill, harden, nip)
1
glob up(expression, set, freeze, thicken, coagulate)
1
glue(verb, place, set, fix, secure)
1
graft(verb, place, set, secure, settle)
1
guard(verb, keep, maintain, encourage, raise)
1
habituate(verb, dull, develop, rough, adjust)
1
hang tough
1
hard
1
harsh
1
hearten(verb, encourage, restore, revive, refresh)
1
heat up(verb, expression, support, increase, sustain)
1
hype(verb, support, increase, sustain, uphold)
1
ice over(expression, freeze, bite, chill, nip)
1
ice up(expression, freeze, bite, chill, nip)
1
implant(verb, place, set, fix, secure)
1
inculcate(verb, place, set, secure, settle)
1
infix(verb, place, set, fix, secure)
1
inflate(verb, harden, thicken, solidify, congeal)
1
ingrain(verb, place, set, secure, settle)
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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>