6
clichéd(adjective, dull, set, beat, hard)
6
close(adjective, warm, oppressive, smelly, stuffy)
6
reeking(adjective, strong, hard, offensive, sweet)
6
spoilt
6
stinking(adjective, strong, hard, offensive, sweet)
6
turned
6
unimaginative(adjective, dull, simple, flat, plain)
6
unmotivated(adjective, uninspired)
6
watery(adjective, dull, hard, weak, flat)
6
wilted(adjective, deterioration)
6
worn out(verb, adjective, phrasal verb)
5
antique(adjective, original, old, outdated, obsolete)
5
archaic(adjective, flat, ordinary, dry, last)
5
contaminated
5
dreary(adjective, dull, flat, warm, ordinary)
5
familiar(adjective, flat, common, ordinary, dry)
5
flavorless(adjective, dull, weak, flat, boring)
5
foetid
5
frowsy
5
hardened(adjective, old)
11 years ago|26k views|share |citing 
APASmart Define. (2015). stale thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/stale/thesaurus/synonyms
ChicagoSmart Define. 2015. "stale thesaurus" https://smartdefine.org/stale/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, stale thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/stale/thesaurus/synonyms>.
MLASmart Define. "stale thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/stale/thesaurus/synonyms>