- Definitions|1
- Thesaurus|270
- Abbreviations|0
| incorrigible(adjective, broken, unchangeable, irreversible, irreparable) | |
| incurable(adjective, broken, unchangeable, irreversible, irreparable) | |
| indicated | |
| inestimable(adjective, rare, precious, priceless, invaluable) | |
| inimitable | |
| irreducible | |
| lone | |
| matchless | |
| needful | |
| out-of-bounds(adjective, rare, precious, invaluable, inestimable) | |
| particular | |
| peerless(single, precious, sole, invaluable, one-off) | |
| prerequisite | |
| rare(adjective, exceptional, exclusive, single, unique) | |
| required | |
| requisite | |
| rich(adjective, rare, precious, invaluable, inestimable) | |
| ruined(adjective, broken, unchangeable, irreversible, irreparable) | |
| single | |
| singular |
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| APA | Smart Define. (2016). irreplaceable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/irreplaceable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "irreplaceable thesaurus" https://smartdefine.org/irreplaceable/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, irreplaceable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/irreplaceable/thesaurus/synonyms>. |
| MLA | Smart Define. "irreplaceable thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/irreplaceable/thesaurus/synonyms> |