51 entries under harden topic. ×
| teach(verb, study, dull, develop, rough) | |
| beef up(expression, strengthen) | |
| build up(expression, strengthen, toughen, roughen) | |
| desensitize(verb, toughen) | |
| expand(verb, relax, mature, thicken) | |
| firm up(expression, strengthen) | |
| make difficult(expression, strengthen) | |
| pervert(verb, thicken, toughen, roughen) | |
| reinforce(close, set, fix, firm, strengthen) | |
| shore up(expression, strengthen) | |
| spread(time, period, interval, toughen) |
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| APA | Smart Define. (2015). season thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/season/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "season thesaurus" https://smartdefine.org/season/thesaurus/synonyms (accessed October 2, 2026). |
| Harvard | Smart Define 2015, season thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/season/thesaurus/synonyms>. |
| MLA | Smart Define. "season thesaurus" 10 April 2015. Web. 2 October 2026. <https://smartdefine.org/season/thesaurus/synonyms> |