1
indefeasible
1
indistinguishable
1
insusceptible of change(expression, idiom)
1
intransmutable
1
irretrievable
1
irreversible
1
irrevocable
1
laid-back(adjective, calm, restrained, unconcerned, subdued)
1
lasting
1
noble
1
nonreturnable
1
nonreversible
1
not influenced(expression, adjective, calm, restrained, unconcerned)
1
one
1
perennial
1
persistent
1
proof(adjective, calm, restrained, unconcerned, subdued)
1
quiescent
1
remaining
1
reverseless
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APASmart Define. (2015). unaltered thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unaltered/thesaurus/synonyms
ChicagoSmart Define. 2015. "unaltered thesaurus" https://smartdefine.org/unaltered/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unaltered thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unaltered/thesaurus/synonyms>.
MLASmart Define. "unaltered thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/unaltered/thesaurus/synonyms>