Synonyms|79Antonyms|12|Broader|0Narrower|0Related|202
0
inveterate
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lengthwise
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livelong
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long-time
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longest
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longtime
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old man(expression, idiom)
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old timer(expression, idiom)
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older
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ongoing(permanent, long-term, lifelong)
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onrushing
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out of date(expression, idiom)
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past
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rootedness
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store up(verb, expression, phrasal verb)
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to the core
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unchanging(permanent, recurrent, perpetual, long-term, lifelong)
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venerable
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very old(expression, idiom)
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APASmart Define. (2013). longstanding thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/longstanding/thesaurus/synonyms
ChicagoSmart Define. 2013. "longstanding thesaurus" https://smartdefine.org/longstanding/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2013, longstanding thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/longstanding/thesaurus/synonyms>.
MLASmart Define. "longstanding thesaurus" 27 June 2013. Web. 22 September 2026. <https://smartdefine.org/longstanding/thesaurus/synonyms>