Synonyms|659Antonyms|171|Broader|2Narrower|0Related|583

44 entries under hard-and-fast topic. ×

1
unmodifiable(adjective, certain, limited, definite, inflexible)
1
unmovable(adjective, certain, limited, definite, inflexible)
1
unwavering(adjective, certain, limited, definite, inflexible)
0
cast-iron(inflexible, intent)
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APASmart Define. (2016). definitive thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/definitive/thesaurus/synonyms
ChicagoSmart Define. 2016. "definitive thesaurus" https://smartdefine.org/definitive/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, definitive thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/definitive/thesaurus/synonyms>.
MLASmart Define. "definitive thesaurus" 31 March 2016. Web. 30 September 2026. <https://smartdefine.org/definitive/thesaurus/synonyms>