- Definitions|1
- Thesaurus|293
- Abbreviations|0
| time-consuming | |
| long | |
| long-standing | |
| old(adjective, permanent, recurrent, perpetual, long-term) | |
| perennial(adjective, enduring, permanent, recurrent, perpetual) | |
| ancient | |
| antique | |
| lasting(adjective, vast, permanent, recurrent, perpetual) | |
| abiding(permanent, recurrent, perpetual, long-term, lifelong) | |
| accumulate | |
| constant(permanent, recurrent, perpetual, long-term, lifelong) | |
| continual(permanent, recurrent, perpetual, long-term, lifelong) | |
| continuing(fundamental, permanent, operating, recurrent, perpetual) | |
| deep-rooted(adjective, permanent, innate, inherent, long-term) | |
| deep-seated(adjective, ingrained) | |
| deep down | |
| durable(permanent, recurrent, perpetual, long-term, lifelong) | |
| elderly | |
| endless(permanent, long-term, lifelong) | |
| enduring(permanent, recurrent, perpetual, long-term, lifelong) |
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| APA | Smart Define. (2013). longstanding thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/longstanding/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "longstanding thesaurus" https://smartdefine.org/longstanding/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2013, longstanding thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/longstanding/thesaurus/synonyms>. |
| MLA | Smart Define. "longstanding thesaurus" 27 June 2013. Web. 21 September 2026. <https://smartdefine.org/longstanding/thesaurus/synonyms> |