Synonyms|270Antonyms|105|Broader|3Narrower|13Related|183
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callus
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capable
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case-harden
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casehardened(close, set, firm, dry, harden)
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cementing
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charge up(verb, expression, support, strengthen, reinforce)
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cheer(encourage, restore, strengthen, hearten)
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chill(verb, set, harden)
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chronic
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coagulation
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concretion
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conform
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crumple
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curd
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curdled
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curdles
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curdling
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deaden
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desensitize(verb, harden)
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dull
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APASmart Define. (2015). toughen thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/toughen/thesaurus/synonyms
ChicagoSmart Define. 2015. "toughen thesaurus" https://smartdefine.org/toughen/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, toughen thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/toughen/thesaurus/synonyms>.
MLASmart Define. "toughen thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/toughen/thesaurus/synonyms>