71 entries under obtuse topic. ×

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addled(adjective, simple, slow, stupid, boring)
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backward(adjective, simple, slow, stupid, boring)
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besotted(adjective, simple, slow, stupid, boring)
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bovine(careless, stupid, unthinking, unperceptive)
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careless(stupid, unthinking, unperceptive, unobservant)
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feeble-minded(adjective, simple, slow, stupid, boring)
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heedless(unperceptive, unobservant)
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ill-advised(careless, stupid, unthinking, unperceptive)
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inadvertent(careless, stupid, unthinking, unperceptive)
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incomprehensible(careless, stupid, unthinking, unperceptive)
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indiscriminating(unperceptive, unobservant)
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indolent(adjective, simple, slow, stupid, boring)
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inept(careless, stupid, unthinking, unperceptive)
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injudicious(careless, stupid, unthinking, unperceptive)
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insensitive(unperceptive, unobservant)
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irreflective(careless, stupid, unthinking, unperceptive)
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neglectful(unperceptive, unobservant)
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negligent(unperceptive, unobservant)
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not bright(expression, adjective, simple, slow, stupid)
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numskulled(adjective, simple, slow, stupid, boring)
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APASmart Define. (2015). vacuous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/vacuous/thesaurus/synonyms
ChicagoSmart Define. 2015. "vacuous thesaurus" https://smartdefine.org/vacuous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, vacuous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/vacuous/thesaurus/synonyms>.
MLASmart Define. "vacuous thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/vacuous/thesaurus/synonyms>