80 entries under harden topic. ×
| strengthen(verb, form, support, make, dull) | |
| brace(noun, verb, form, support, make) | |
| fortify(verb, form, support, make, close) | |
| nerve(noun, verb, close, set, fix) | |
| reinforce(verb, support, close, set, fix) | |
| gird(verb, form, support, make, close) | |
| stiffen(verb, dull, close, set, fix) | |
| temper(verb, close, set, fix, settle) | |
| toughen(verb, support, close, set, fix) | |
| cement(verb, close, set, fix, settle) | |
| indurate(verb, dull, close, set, fix) | |
| inure(verb, dull, develop, rough, prepare) | |
| buttress(verb, support, close, set, fix) | |
| firm(noun, verb, adjective, close, set) | |
| season(verb, dull, close, set, develop) | |
| anneal(verb, support, close, set, fix) | |
| callous(verb, dull, close, set, fix) | |
| adapt(verb, make, dull, place, develop) | |
| adjust(verb, form, make, dull, place) | |
| amalgamate(verb, close, set, fix, settle) |
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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> |