116 entries under harden topic. ×
| brutalize(verb, dull, develop, rough, adjust) | |
| build up(verb, expression, support, increase, sustain) | |
| calcify(verb, close, set, fix, settle) | |
| callus(verb, dull, develop, rough, adjust) | |
| case-harden(verb, dull, develop, rough, adjust) | |
| climatize(verb, dull, develop, rough, adjust) | |
| coarsen(verb, dull, develop, rough, adjust) | |
| cohere(form, set, develop, firm, freeze) | |
| compact(verb, close, set, fix, settle) | |
| concrete(close, set, thicken, coagulate) | |
| conform(verb, dull, develop, rough, adjust) | |
| contract(verb, close, set, fix, settle) | |
| deaden(verb, dull, develop, rough, adjust) | |
| densify(verb, close, set, fix, settle) | |
| develop(verb, form, dull, rough, adjust) | |
| discipline(verb, dull, develop, rough, adjust) | |
| dry(verb, close, set, fix, settle) | |
| dull(verb, develop, rough, adjust, scratch) | |
| embitter(verb, dull, develop, rough, adjust) | |
| feed(verb, keep, maintain, encourage, raise) |
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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> |