60 entries under hard topic. ×

72
antiquated(adjective, feature, characteristic, dull)
41
passé(adjective, feature, characteristic, dull)
39
out-of-date(adjective, feature, characteristic, dull)
27
past(adjective, last, odd, sour)
16
stale(adjective, beat, last, dead)
12
timeworn(adjective, beat, new, dead)
9
hackneyed(adjective, beat, informal, last)
8
unoriginal(adjective, last, tired, remote)
7
tired(adjective, beat, common, feeble)
6
worn-out(adjective, common, last, feeble)
5
threadbare(adjective, beat, feeble, tired)
5
trite(adjective, tired, sour, stale)
5
dead(verb, adjective, phrasal verb, odd)
4
banal(adjective, tired, sour, stale)
4
moth-eaten(adjective, last, dead, tired)
4
out(adjective, dead, odd, sour)
4
decayed(adjective, last, sour, stale)
4
fusty(adjective, dull, new, sour)
4
musty(adjective, odd, sour, stale)
3
corny(adjective, tired, odd, sour)
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APASmart Define. (2016). old thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/old/thesaurus/synonyms
ChicagoSmart Define. 2016. "old thesaurus" https://smartdefine.org/old/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, old thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/old/thesaurus/synonyms>.
MLASmart Define. "old thesaurus" 29 February 2016. Web. 23 September 2026. <https://smartdefine.org/old/thesaurus/synonyms>