190 entries under adjective topic. ×

4
unmindful(obtuse, unperceptive, unobservant)
4
unreasonable(careless, stupid, thoughtless, absurd)
4
unreasoning(careless, stupid, empty, unthinking)
3
absent(usual, deficient, incogitancy)
3
absurd
3
brainless(dull, simple, slow, stupid)
3
characterless(dreary, monotonous, uninteresting, unlively)
3
daft(simple, slow, silly, stupid)
3
dense(dull, simple, slow, stupid)
3
drained(clear, free, stupid, empty)
3
forgetful
3
idiotic
3
illogical
3
inconsiderate
3
lifeless(dull, quiet, flat, heavy)
3
nonsensical(simple, stupid, crazy, insignificant)
3
ridiculous
3
unexisting
3
unfilled(clear, free, bare, empty)
3
unsubstantial
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APASmart Define. (2015). vacuous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/vacuous/thesaurus/synonyms
ChicagoSmart Define. 2015. "vacuous thesaurus" https://smartdefine.org/vacuous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, vacuous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/vacuous/thesaurus/synonyms>.
MLASmart Define. "vacuous thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/vacuous/thesaurus/synonyms>