97 entries under toughen topic. ×
| stiffen(verb, form, support, close, place) | |
| strengthen(verb, support, close, set, meet) | |
| thicken(verb, form, close, place, set) | |
| brace(noun, verb, support, close, set) | |
| indurate(verb, adjective, close, set, settle) | |
| inure(verb, study, develop, improve, prepare) | |
| fortify(verb, support, close, set, strong) | |
| reinforce(verb, support, close, set, increase) | |
| season(noun, verb, study, close, set) | |
| temper(noun, verb, close, set, settle) | |
| accustom(verb, study, develop, improve, prepare) | |
| consolidate(verb, support, close, place, set) | |
| steel(verb, support, close, set, increase) | |
| acclimatize(verb, close, set, continue, firm) | |
| acclimate(verb, close, set, keep, overcome) | |
| brutalize(verb, corrupt, feel, strengthen, emotions) | |
| confirm(verb, support, strong, increase, establish) | |
| invigorate(verb, support, increase, raise, strength) | |
| anneal(verb, support, close, set, increase) | |
| buttress(verb, support, close, set, increase) |
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| APA | Smart Define. (2016). harden thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/harden/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, harden thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>. |
| MLA | Smart Define. "harden thesaurus" 24 March 2016. Web. 30 September 2026. <https://smartdefine.org/harden/thesaurus/synonyms> |