97 entries under toughen topic. ×
| blunt(verb, thicken, stabilize, season) | |
| callus(noun, verb, calcify, thicken, stabilize) | |
| dull(verb, thicken, stabilize, season) | |
| establish(verb, support, place, set, increase) | |
| paralyze(verb, thicken, stabilize, season) | |
| restore(verb, support, increase, raise, strength) | |
| stun(verb, thicken, stabilize, season) | |
| stupefy(verb, thicken, stabilize, season) | |
| teach(verb, study, develop, improve, prepare) | |
| build up(verb, expression, support, increase, develop) | |
| add(verb, support, increase, establish, extend) | |
| add fuel to fire(verb, expression, idiom, support, increase) | |
| ascend(verb, support, increase, establish, extend) | |
| augment(verb, support, increase, boost, sustain) | |
| back up(verb, expression, support, increase, boost) | |
| bolster(verb, support, increase, establish, extend) | |
| case-harden(verb, calcify, thicken, stabilize) | |
| climatize(verb, prepare, adjust, strengthen, adapt) | |
| corroborate(verb, support, increase, establish, extend) | |
| deaden(verb, thicken, stabilize, season) |
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| APA | Smart Define. (2016). harden thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/harden/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2016, harden thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>. |
| MLA | Smart Define. "harden thesaurus" 24 March 2016. Web. 1 October 2026. <https://smartdefine.org/harden/thesaurus/synonyms> |