1
imbecile
1
imprecise
1
inaccurate
1
inactive
1
indisposed
1
insane
1
knuckleheaded
1
kooky
1
lazy(adjective, slow)
1
lessened
1
lethargic(adjective, calm, indifferent)
1
level
1
light
1
lightened
1
limp
1
listless
1
loony
1
low-grade
1
lowbrow
1
lunatic
10 years ago|5.6k views|share |citing 
APASmart Define. (2016). keen thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/keen/thesaurus/antonyms
ChicagoSmart Define. 2016. "keen thesaurus" https://smartdefine.org/keen/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2016, keen thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/keen/thesaurus/antonyms>.
MLASmart Define. "keen thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/keen/thesaurus/antonyms>