9
classy(adjective, style, taste, fashion)
5
all-night
5
durable
5
lengthy
4
forever(adverb, ever, perpetually, permanently, enduringly)
4
gargantuan(noun, verb, adjective, adverb)
4
lasting
4
long-lasting
4
long-lived
4
long-snouted
4
long-staple
4
nightlong
4
prolonged
4
protracted
4
strong(feature, action, force, strength, doing)
4
titanic
3
agelong
3
bimestrial
3
daylong
3
drawn-out
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APASmart Define. (2016). long thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/long/thesaurus/related
ChicagoSmart Define. 2016. "long thesaurus" https://smartdefine.org/long/thesaurus/related (accessed September 21, 2026).
HarvardSmart Define 2016, long thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/long/thesaurus/related>.
MLASmart Define. "long thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/long/thesaurus/related>