Synonyms|160Antonyms|2|Broader|0Narrower|0Related|108

43 entries under toughen topic. ×

1
tone up(verb, expression, phrasal verb, support, increase)
1
wax(verb, support, increase, establish, extend)
0
make stronger(verb, expression, powerful, fortify, brace)
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APASmart Define. (2011). add fuel to fire thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/add_fuel_to_fire/thesaurus/synonyms
ChicagoSmart Define. 2011. "add fuel to fire thesaurus" https://smartdefine.org/add_fuel_to_fire/thesaurus/synonyms (accessed October 2, 2026).
HarvardSmart Define 2011, add fuel to fire thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/add_fuel_to_fire/thesaurus/synonyms>.
MLASmart Define. "add fuel to fire thesaurus" 24 May 2011. Web. 2 October 2026. <https://smartdefine.org/add_fuel_to_fire/thesaurus/synonyms>