81 entries under plain topic. ×

3
unstimulating(adjective, dull, weak, mild)
3
waterish(adjective, good, dull, weak, flat)
3
zero(adjective, dull, weak, simple, flat)
2
hackneyed(adjective, dull, set, simple, flat)
2
ho hum(expression, adjective, dull, weak, flat)
2
nowhere(adjective, dull, weak, simple, flat)
2
pabulum(adjective, dull, weak, simple, flat)
2
platitudinous(adjective, dull, set, simple, flat)
2
routine(adjective, dull, set, weak, simple)
2
sapless(adjective, dull, weak, mild)
2
vanilla(adjective, dull, weak, simple, flat)
1
actual(adjective, simple, flat, clean)
1
balmy(adjective, calm, weak, kind, smooth)
1
calm(adjective, weak, kind, smooth, soft)
1
clean(adjective, simple, flat, ordinary)
1
diddly(adjective, simple, flat, clean)
1
dull as dishwater(expression, adjective, idiom, dull, weak)
1
everyday(adjective, simple, stupid, ordinary)
1
garden-variety(adjective, simple, flat, clean)
1
irksome(adjective, dull, simple, clean)
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APASmart Define. (2015). vapid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/vapid/thesaurus/synonyms
ChicagoSmart Define. 2015. "vapid thesaurus" https://smartdefine.org/vapid/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, vapid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/vapid/thesaurus/synonyms>.
MLASmart Define. "vapid thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/vapid/thesaurus/synonyms>