1
incorrigible(adjective, broken, unchangeable, irreversible, irreparable)
1
incurable(adjective, broken, unchangeable, irreversible, irreparable)
1
indicated
1
inestimable(adjective, rare, precious, priceless, invaluable)
1
inimitable
1
irreducible
1
lone
1
matchless
1
needful
1
out-of-bounds(adjective, rare, precious, invaluable, inestimable)
1
particular
1
peerless(single, precious, sole, invaluable, one-off)
1
prerequisite
1
rare(adjective, exceptional, exclusive, single, unique)
1
required
1
requisite
1
rich(adjective, rare, precious, invaluable, inestimable)
1
ruined(adjective, broken, unchangeable, irreversible, irreparable)
1
single
1
singular
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APASmart Define. (2016). irreplaceable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/irreplaceable/thesaurus/synonyms
ChicagoSmart Define. 2016. "irreplaceable thesaurus" https://smartdefine.org/irreplaceable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, irreplaceable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/irreplaceable/thesaurus/synonyms>.
MLASmart Define. "irreplaceable thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/irreplaceable/thesaurus/synonyms>