2
everlasting
2
fateful(expected, predictable, necessary, inexorable, undeniable)
2
flat
2
hard-and-fast(adjective, strict)
2
hopeless(adjective, pessimistic, futile)
2
imperative(necessary, required, obligatory, conclusive)
2
inalterable
2
indissoluble(stability, necessary, required, obligatory, conclusive)
2
inflexible(set, strict, expected, predictable, necessary)
2
insusceptible of change(expression, idiom, stability)
2
irreducible
2
irresoluble
2
irrevocably
2
lasting(adjective, severe)
2
mandatory(set, strict, necessary, required, obligatory)
2
necessary(expected, predictable, inexorable, required, obligatory)
2
obligatory(expected, predictable, necessary, inexorable, required)
2
passed
2
remediless
2
required(necessary, obligatory, conclusive)
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APASmart Define. (2015). irrevocable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/irrevocable/thesaurus/synonyms
ChicagoSmart Define. 2015. "irrevocable thesaurus" https://smartdefine.org/irrevocable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, irrevocable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/irrevocable/thesaurus/synonyms>.
MLASmart Define. "irrevocable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/irrevocable/thesaurus/synonyms>