90 entries under toughen topic. ×
| add(verb, support, increase, establish, extend) | |
| add fuel to fire(verb, expression, idiom, support, increase) | |
| ascend(verb, support, increase, establish, extend) | |
| blunt(verb, dull, develop, rough, adjust) | |
| build up(verb, expression, form, support, make) | |
| callus(verb, dull, develop, rough, adjust) | |
| case-harden(verb, dull, develop, rough, adjust) | |
| climatize(verb, dull, develop, rough, prepare) | |
| coarsen(verb, dull, develop, rough, adjust) | |
| conform(verb, dull, develop, rough, adjust) | |
| deaden(verb, dull, develop, rough, adjust) | |
| discipline(verb, dull, develop, rough, prepare) | |
| dull(verb, develop, rough, adjust, scratch) | |
| embitter(verb, dull, develop, rough, adjust) | |
| empower(verb, support, increase, establish, extend) | |
| enlarge(verb, support, increase, establish, extend) | |
| establish(verb, support, increase, extend, restore) | |
| extend(verb, support, increase, establish, restore) | |
| habituate(verb, dull, develop, rough, prepare) | |
| heighten(verb, support, increase, establish, extend) |
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| APA | Smart Define. (2016). steel thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/steel/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "steel thesaurus" https://smartdefine.org/steel/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2016, steel thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/steel/thesaurus/synonyms>. |
| MLA | Smart Define. "steel thesaurus" 24 January 2016. Web. 1 October 2026. <https://smartdefine.org/steel/thesaurus/synonyms> |