116 entries under harden topic. ×
| gird(verb, close, set, fix, settle) | |
| increase(verb, support, sustain, uphold, strengthen) | |
| numb(verb, dull, develop, rough, adjust) | |
| precipitate(verb, close, set, fix, settle) | |
| settle(verb, calm, close, set, fix) | |
| stabilize(verb, calm, place, set, fix) | |
| steady(verb, calm, place, set, fix) | |
| vitrify(verb, close, set, fix, settle) | |
| acclimate(verb, dull, close, set, develop) | |
| acclimatize(verb, dull, close, set, develop) | |
| accustom(verb, dull, develop, rough, adjust) | |
| adapt(verb, dull, develop, rough, adjust) | |
| adjust(verb, dull, develop, rough, scratch) | |
| amalgamate(verb, close, set, fix, settle) | |
| anneal(verb, close, set, fix, settle) | |
| augment(verb, support, increase, sustain, uphold) | |
| bake(verb, close, set, fix, settle) | |
| become rigid(verb, expression, thicken, solidify) | |
| bite(freeze, chill, nip, solidify) | |
| blunt(verb, dull, develop, rough, adjust) |
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| APA | Smart Define. (2015). stiffen thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, stiffen thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>. |
| MLA | Smart Define. "stiffen thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms> |