Synonyms|178Antonyms|0|Broader|2Narrower|0Related|5

64 entries under strengthen topic. ×

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inure
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invigorate
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lighten(verb, severe, exercise)
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magnify(verb, severe, exercise)
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make difficult(expression, harden)
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make firm(expression, fortify)
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point(verb, severe, exercise)
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pour it on(verb, severe, exercise)
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quicken(verb, severe, exercise)
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raise(verb, severe, exercise)
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redouble(verb, severe, exercise)
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reinforce(verb, severe, exercise, fortify)
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rise(verb, severe, exercise)
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rouse(verb, severe, exercise)
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season
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set off(verb, expression, severe, exercise)
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severe(verb, exercise)
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sharpen(verb, severe, exercise)
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shore up(expression, harden)
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spike(verb, severe, exercise)
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APASmart Define. (2015). firm up thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/firm_up/thesaurus/synonyms
ChicagoSmart Define. 2015. "firm up thesaurus" https://smartdefine.org/firm_up/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, firm up thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/firm_up/thesaurus/synonyms>.
MLASmart Define. "firm up thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/firm_up/thesaurus/synonyms>