- Definitions|0
- Thesaurus|147
- Abbreviations|0
17 entries under harden topic. ×
| toughen(verb, strengthen) | |
| acclimate(verb, strengthen) | |
| acclimatize(verb, strengthen) | |
| anneal(verb, strengthen) | |
| beef up(expression, strengthen) | |
| brutalize(verb, strengthen) | |
| build up(expression, strengthen) | |
| climatize(verb, strengthen) | |
| develop(verb, strengthen) | |
| firm up(expression, strengthen) | |
| fortify | |
| inure(verb, strengthen) | |
| reinforce | |
| season(verb, strengthen) | |
| shore up(expression, strengthen) | |
| strengthen | |
| temper(verb, strengthen) |
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| APA | Smart Define. (2013). make difficult thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/make_difficult/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "make difficult thesaurus" https://smartdefine.org/make_difficult/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2013, make difficult thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/make_difficult/thesaurus/synonyms>. |
| MLA | Smart Define. "make difficult thesaurus" 18 May 2013. Web. 21 September 2026. <https://smartdefine.org/make_difficult/thesaurus/synonyms> |