| of long standing(expression, idiom) | |
| old(adjective, continue, hardened, confirmed, recurrent) | |
| ongoing(constant, current, continuous, incessant, long-term) | |
| perduring(adjective, constant, lasting) | |
| persevering | |
| relentless(adjective, steady, persistent, constant, continuous) | |
| reliable(adjective, calm, strong, tough, solid) | |
| resolute(calm, strong, firm, solid, true) | |
| sempervirent | |
| set in stone(expression, adjective, idiom, calm, fixed) | |
| staunch(calm, strong, firm, solid, true) | |
| sturdy(adjective, calm, strong, tough, steady) | |
| tenacious(secure, tough, firm, true, fixed) | |
| unbroken(adjective, steady, stable, regular, fixed) | |
| unerasable | |
| unflagging | |
| uniform(adjective, calm, strong, secure, firm) | |
| unintermitting | |
| unswerving | |
| upright |
For more, visit
Permanent on
Power Thesaurus
| APA | Smart Define. (2016). permanent thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/permanent/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "permanent thesaurus" https://smartdefine.org/permanent/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, permanent thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/permanent/thesaurus/synonyms>. |
| MLA | Smart Define. "permanent thesaurus" 26 February 2016. Web. 20 September 2026. <https://smartdefine.org/permanent/thesaurus/synonyms> |