0
stringent
0
stubborn as a mule(adjective, idiom, resist, firmly)
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substantial
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ultraconservative
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unassailable
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unfaltering
0
unshakable
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waterproof
0
watertight
13 years ago|1.3k views|share |citing 
APASmart Define. (2013). brassbound thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/brassbound/thesaurus/synonyms
ChicagoSmart Define. 2013. "brassbound thesaurus" https://smartdefine.org/brassbound/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, brassbound thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/brassbound/thesaurus/synonyms>.
MLASmart Define. "brassbound thesaurus" 28 June 2013. Web. 23 September 2026. <https://smartdefine.org/brassbound/thesaurus/synonyms>