90 entries under toughen topic. ×
| stupefy(verb, dull, develop, rough, adjust) | |
| substantiate(verb, support, increase, encourage, establish) | |
| teach(verb, dull, develop, rough, adjust) | |
| thicken(verb, close, set, fix, settle) | |
| tone up(verb, expression, support, increase, establish) | |
| wax(verb, support, increase, establish, extend) | |
| corroborate(verb, support, increase, establish, extend) | |
| make stronger(verb, expression, support, powerful, strengthen) | |
| prepare oneself(verb, expression, strengthen) | |
| rough(verb, adjective, strong, hard, tough) |
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| APA | Smart Define. (2016). steel thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/steel/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "steel thesaurus" https://smartdefine.org/steel/thesaurus/synonyms (accessed October 2, 2026). |
| Harvard | Smart Define 2016, steel thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/steel/thesaurus/synonyms>. |
| MLA | Smart Define. "steel thesaurus" 24 January 2016. Web. 2 October 2026. <https://smartdefine.org/steel/thesaurus/synonyms> |