116 entries under harden topic. ×
| stupefy(verb, dull, develop, rough, adjust) | |
| teach(verb, dull, develop, rough, adjust) | |
| train(verb, dull, develop, rough, adjust) | |
| become firm(verb, expression, fix, solidify) | |
| become hard(verb, expression, solidify) | |
| braze(verb, set, jellied, gel) | |
| caseharden(close, set, jellied, gel) | |
| compress(firm, constrict, tauten) | |
| expand(swell, condense, thicken, toughen) | |
| get hard(verb, expression, set, freeze) | |
| mold(verb, set) | |
| press down(expression, firm) | |
| swell(rise, expand, condense, thicken) | |
| tamp | |
| toughen up(verb, expression, set, jellied) | |
| turn to ice(expression, idiom, solidify) |
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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> |