| ingrained(usual, fixed, persistent, established, hardened) | |
| intransigent(adjective, persistent, constant, pitiless, unyielding) | |
| iron-fisted(adjective, persistent, constant, pitiless, unyielding) | |
| joined | |
| jointless | |
| lifelong(adjective, fixed, persistent, continuous, lasting) | |
| like bad penny | |
| like the Rock of Gibralter(expression, adjective, idiom, steady, stable) | |
| limitless(constant, abundant, unrestrained, endless, immense) | |
| lingering(fixed, persistent, lasting, remaining, chronic) | |
| linked | |
| locust | |
| long-lasting(stable, constant, enduring, lasting, permanent) | |
| long-lived(persistent, continuous, lasting, continuing, recurrent) | |
| long-standing(persistent, continuous, lasting, continuing, remaining) | |
| long-term(permanent, lifelong) | |
| longstanding(permanent, recurrent, perpetual, long-term, lifelong) | |
| low | |
| machine gun | |
| many(adjective, regular, normal, recurrent) |
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| APA | Smart Define. (2016). continual thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/continual/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "continual thesaurus" https://smartdefine.org/continual/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, continual thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/continual/thesaurus/synonyms>. |
| MLA | Smart Define. "continual thesaurus" 12 February 2016. Web. 22 September 2026. <https://smartdefine.org/continual/thesaurus/synonyms> |