10
old-fashioned(adjective, dull, warm, last, original)
10
overused(adjective, dull, set, beat, hard)
10
pedestrian(adjective, dull, set, mean, simple)
10
prosaic(adjective, dull, set, weak, simple)
10
stock(adjective, dull, set, flat, silly)
10
tasteless(adjective, dull, hard, weak, flat)
10
tedious(adjective, dull, weak, simple, flat)
9
bad(adjective, rank, corrupt, foul, disgusting)
9
cold(adjective, flat)
9
corny(adjective, dull, set, hard, flat)
9
dusty(adjective, dull, hard, dry, boring)
9
foul(adjective, quiet, strong, offensive, sweet)
9
monotonous(adjective, dull, weak, simple, flat)
9
not good
9
obsolete(adjective, last, original, tired, other)
9
weak(adjective, dull, hard, flat, boring)
8
decayed(adjective, hard, corrupt, foul, disgusting)
8
off(adjective, bad, rank, foul, disagreeable)
8
old hat(expression, adjective, dull, set, flat)
8
smelly(adjective, strong, hard, warm, offensive)
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>