6
unperceptive
4
dumb
4
silly
3
dense
3
stupid(adjective, dull)
2
idiotic(adjective, dull)
2
obtuse
1
simple
1
unintelligent(adjective, dull)
1
vacuous
1
slow-witted
1
thick
1
unsmart
1
weak-minded
1
witless
1
woodenheaded
0
brainless
0
dull
0
foolish(adjective, dull)
0
slow(adjective, dull)
11 years ago|1.2k views|share |citing 
APASmart Define. (2015). insightful thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/insightful/thesaurus/antonyms
ChicagoSmart Define. 2015. "insightful thesaurus" https://smartdefine.org/insightful/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, insightful thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/insightful/thesaurus/antonyms>.
MLASmart Define. "insightful thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/insightful/thesaurus/antonyms>