6
frivolous
6
hare-brained
6
risible
6
screwy
6
unwise(adjective, weak, simple, silly, foolish)
5
crass(adjective, coarse, insensitive)
5
dim-witted(adjective, foolish, stupid)
5
dizzy
5
dull(adjective, simple, silly, foolish, stupid)
5
empty
5
feeble-minded(adjective, foolish, stupid)
5
half-witted(adjective, weak, simple, silly, foolish)
5
illogical(adjective, simple, silly, stupid, insignificant)
5
obtuse(adjective, silly, foolish, stupid, vulgar)
5
puerile
5
shallow(adjective, silly, stupid, green, fat)
5
trivial(adjective, silly, stupid, insignificant, ridiculous)
4
childish
4
cuckoo
4
fool
11 years ago|18k views|share |citing 
APASmart Define. (2015). asinine thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/asinine/thesaurus/synonyms
ChicagoSmart Define. 2015. "asinine thesaurus" https://smartdefine.org/asinine/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, asinine thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/asinine/thesaurus/synonyms>.
MLASmart Define. "asinine thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/asinine/thesaurus/synonyms>