- Definitions|1
- Thesaurus|185
- Abbreviations|0
17 entries under harden topic. ×
| acclimate | |
| acclimatize | |
| anneal | |
| beef up(verb, expression, severe, exercise, strengthen) | |
| brutalize | |
| build up(verb, expression, severe, exercise, strengthen) | |
| climatize | |
| develop | |
| fortify | |
| inure | |
| make difficult(expression, strengthen) | |
| reinforce(verb, severe, exercise, strengthen, fortify) | |
| season | |
| shore up(expression, strengthen) | |
| strengthen(verb, severe, exercise, fortify) | |
| temper | |
| toughen |
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| APA | Smart Define. (2015). firm up thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/firm_up/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "firm up thesaurus" https://smartdefine.org/firm_up/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, firm up thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/firm_up/thesaurus/synonyms>. |
| MLA | Smart Define. "firm up thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/firm_up/thesaurus/synonyms> |