Synonyms|487Antonyms|204|Broader|7Narrower|0Related|1k
1
impetuous
1
imprudent(careless, stupid, absurd, unthinking, obtuse)
1
indiscriminate(adjective, insignificant, irregular, empty, senseless)
1
inessential(adjective, unsubstantial)
1
inexperienced
1
inexpressive(adjective, dull, indifferent, dead, blank)
1
innocent
1
inscrutable(adjective, dull, dead, impassive, unresponsive)
1
insensate(adjective, dull, simple, slow, stupid)
1
insignificance(adjective, unsubstantial)
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insignificant(adjective, irregular, useless, empty, senseless)
1
intangible(adjective, unsubstantial)
1
irregular(adjective, insignificant, useless, empty, senseless)
1
irresponsible
1
know-nothing
1
knuckleheaded
1
lackluster(adjective, dull, dead, impassive, dreary)
1
lacklustre
1
lamebrained(adjective, careless, silly, stupid, empty)
1
ludicrous
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ChicagoSmart Define. 2015. "vacuous thesaurus" https://smartdefine.org/vacuous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, vacuous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/vacuous/thesaurus/synonyms>.
MLASmart Define. "vacuous thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/vacuous/thesaurus/synonyms>