1
compact(verb, close, set, fix, settle)
1
concrete(close, set, harden, thicken, coagulate)
1
confine
1
conform(verb, dull, develop, rough, adjust)
1
connect(verb, place, set, fix, secure)
1
contract(verb, close, set, fix, settle)
1
couple(verb, place, set, fix, secure)
1
cumber
1
curb
1
deaden(verb, dull, develop, rough, adjust)
1
densify(verb, close, set, fix, settle)
1
develop(verb, form, dull, rough, adjust)
1
discipline(verb, dull, develop, rough, adjust)
1
dry(verb, close, set, fix, settle)
1
dull(verb, develop, rough, adjust, scratch)
1
electrify
1
embed(verb, place, set, fix, secure)
1
embitter(verb, dull, develop, rough, adjust)
1
emphasize(verb, support, increase, sustain, uphold)
1
encourage(verb, keep, maintain, raise, back)
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>