- Definitions|2
- Thesaurus|855
- Abbreviations|0
| homogeneous(adjective, continuous) | |
| hydrophyte | |
| immemorial(lasting, permanent, everlasting, unending, undying) | |
| in for the long haul(expression, idiom, stable, enduring, lasting) | |
| inbred(persistent, continuous, hardened, lasting, continuing) | |
| incurable(persistent, continuous, hardened, lasting, continuing) | |
| indeciduous | |
| indefatigable(adjective, continuous) | |
| indefinite(lasting, permanent, everlasting, unending, undying) | |
| indelible(adjective, permanent, long-term, lifelong) | |
| indissoluble(permanent, everlasting, eternal, long-term, undying) | |
| ineradicable(adjective, persistent, continuous, hardened, lasting) | |
| inexhaustible(permanent, long-term, lifelong) | |
| inexpungible(permanent, long-term, lifelong) | |
| ingrained(persistent, continuous, hardened, lasting, continuing) | |
| intransitive | |
| invariably | |
| joined | |
| jointless | |
| level(adjective, continuous) |
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| APA | Smart Define. (2015). perennial thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/perennial/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "perennial thesaurus" https://smartdefine.org/perennial/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, perennial thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/perennial/thesaurus/synonyms>. |
| MLA | Smart Define. "perennial thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/perennial/thesaurus/synonyms> |