40 entries under obtuse topic. ×

6
mindless(adjective, careless, foolish, stupid, unreasonable)
5
vacuous(adjective, careless, stupid, empty, unthinking)
4
heedless(adjective, dull, careless, indifferent, thoughtless)
4
witless(careless, stupid, thoughtless, unthinking, inconsiderate)
3
rash(adjective, careless, thoughtless, inconsiderate)
2
careless(adjective, dull, indifferent, foolish, stupid)
2
dull(adjective, careless, stupid, unthinking, unintelligent)
2
empty-headed(careless, stupid, unthinking, unperceptive)
2
ignorant(adjective, dull, careless, indifferent, thoughtless)
2
inadvertent(adjective, careless, foolish, stupid, thoughtless)
2
inane(careless, stupid, unthinking, unintelligent)
2
inept(careless, stupid, unthinking, unperceptive)
1
ill-considered(careless, stupid, unthinking, unperceptive)
1
inattentive(adjective, dull, careless, indifferent, stupid)
1
injudicious(adjective, wrong, careless, indifferent, foolish)
1
insensitive(adjective, dull, careless, indifferent, thoughtless)
1
lamebrained(careless, stupid, unthinking, unintelligent)
1
loony(careless, foolish, stupid, unreasonable, unthinking)
1
neglectful(adjective, dull, careless, indifferent, stupid)
1
reckless(unperceptive, unobservant)
<12>
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APASmart Define. (2015). unreasoning thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unreasoning/thesaurus/synonyms
ChicagoSmart Define. 2015. "unreasoning thesaurus" https://smartdefine.org/unreasoning/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, unreasoning thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unreasoning/thesaurus/synonyms>.
MLASmart Define. "unreasoning thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/unreasoning/thesaurus/synonyms>