3
nonsensical(adjective, careless, stupid, illogical)
3
ridiculous(adjective, careless, stupid, illogical)
3
senseless(adjective, sensible, careless, silly, stupid)
3
unrealistic(adjective, careless, stupid, illogical)
3
unsound(adjective, strong, sound, careless, stupid)
3
wild
2
brainless
2
capricious
2
disjointed
2
doltish
2
dorky
2
goofy
2
harebrained
2
incoherent
2
meaningless(reasonable, meaningful)
2
nonintellectual
2
nutty
2
physical
2
psycho
2
thickheaded
10 years ago|4k views|share |citing 
APASmart Define. (2016). rational thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rational/thesaurus/antonyms
ChicagoSmart Define. 2016. "rational thesaurus" https://smartdefine.org/rational/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2016, rational thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rational/thesaurus/antonyms>.
MLASmart Define. "rational thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/rational/thesaurus/antonyms>