3
gormless
3
half-witted(weak, simple, silly, foolish, thoughtless)
3
harebrained(weak, simple, silly, foolish, stupid)
3
ineffective
3
ineffectual
3
inept
3
jejune
3
purposeless(adjective, silly, stupid, insignificant, ridiculous)
3
reckless(silly, thoughtless, unwise)
3
risible
3
simple-minded(adjective, foolish, stupid)
3
slow-witted
3
thick-witted(adjective, foolish, crazy, insane)
3
unoccupied(adjective, thoughtless)
3
vain(adjective, silly, ridiculous, absurd, pointless)
3
vapid
2
jerky(adjective, characteristic, weak, simple, silly)
2
vacant(adjective, thoughtless, imbecility folly)
2
blank(adjective, thoughtless)
2
airheaded
11 years ago|23k views|share |citing 
APASmart Define. (2015). fatuous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fatuous/thesaurus/synonyms
ChicagoSmart Define. 2015. "fatuous thesaurus" https://smartdefine.org/fatuous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, fatuous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fatuous/thesaurus/synonyms>.
MLASmart Define. "fatuous thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/fatuous/thesaurus/synonyms>