Synonyms|359Antonyms|67|Broader|1Narrower|0Related|355

42 entries under tough topic. ×

1
tenacious(adjective, strong, sound, secure)
1
vigorous(adjective, strong, sound, solid)
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APASmart Define. (2016). well-founded thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/well-founded/thesaurus/synonyms
ChicagoSmart Define. 2016. "well-founded thesaurus" https://smartdefine.org/well-founded/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, well-founded thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/well-founded/thesaurus/synonyms>.
MLASmart Define. "well-founded thesaurus" 29 March 2016. Web. 30 September 2026. <https://smartdefine.org/well-founded/thesaurus/synonyms>