1
simpleminded
1
slow
1
slow-witted
1
slow up
1
snob
1
soft
1
spendthrift
1
stupid(adjective, sharp, foolish, intelligent, unsound)
1
tall(adjective, unreasonable, little, exaggerated)
1
thick(adjective, unreasonable)
1
thickheaded
1
thoughtless(reasonable, prudent)
1
tipsy
1
trippy(state, behavior)
1
unconscious
1
undemonstrative
1
undiplomatic
1
undistinguishable
1
undue(adjective, excessive, unnecessary)
1
uneducated
10 years ago|5.1k views|share |citing 
APASmart Define. (2016). sensible thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sensible/thesaurus/antonyms
ChicagoSmart Define. 2016. "sensible thesaurus" https://smartdefine.org/sensible/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, sensible thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sensible/thesaurus/antonyms>.
MLASmart Define. "sensible thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/sensible/thesaurus/antonyms>