62 entries under hard topic. ×

44
out-of-date(adjective, feature, characteristic, dull)
42
antiquated(adjective, feature, characteristic, dull)
40
old(adjective, feature, characteristic, dull)
8
fusty(adjective, dull, new, tired)
8
out(adjective, informal, dead, odd)
7
past(adjective, last, original, odd)
6
dead(adjective, informal, odd, out)
5
musty(adjective, odd, out, old)
4
moth-eaten(last, original, old, sour)
4
timeworn(old, sour, past, gray)
3
stale(adjective, last, original, old)
2
corny(adjective, dull, informal, odd)
2
threadbare(adjective, dull, old, sour)
2
worn-out(adjective, dull, last, original)
1
bent(dull, tired, old, sour)
1
decayed(last, original, remote, old)
1
drab(dull, plain, tired, old)
1
dull(plain, tired, old, sour)
1
dusty(dull, dead, out, old)
1
effete(adjective, dull, old, sour)
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APASmart Define. (2016). passe thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/passe/thesaurus/synonyms
ChicagoSmart Define. 2016. "passe thesaurus" https://smartdefine.org/passe/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, passe thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/passe/thesaurus/synonyms>.
MLASmart Define. "passe thesaurus" 28 March 2016. Web. 24 September 2026. <https://smartdefine.org/passe/thesaurus/synonyms>