Synonyms|21Antonyms|4|Broader|0Narrower|0Related|143
4
time-consuming
2
old
2
long-standing
2
longstanding
1
ancient
1
antique
1
former
1
hoary
1
long
1
long-time
1
olden
1
past
1
venerable
0
deep-rooted
0
deep-seated(adjective, ingrained)
0
disciplined
0
long-established
0
long-lasting
0
longer
0
very old(expression, idiom)
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APASmart Define. (2015). longtime thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/longtime/thesaurus/synonyms
ChicagoSmart Define. 2015. "longtime thesaurus" https://smartdefine.org/longtime/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, longtime thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/longtime/thesaurus/synonyms>.
MLASmart Define. "longtime thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/longtime/thesaurus/synonyms>