10
dysfunctional(work, feature, state, adjective, function)
7
medical
6
inactive(adjective, passive)
5
dead(adjective, working)
5
inoperative
3
defunct(adjective, functioning, extinct)
3
dormant
3
idle
3
ineffective
3
ineffectual
3
inert
3
inoperable
3
latent
3
nonfunctional
3
unusable
3
useless
3
worthless
2
asleep
2
down
2
fallow
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APASmart Define. (2015). operative thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/operative/thesaurus/antonyms
ChicagoSmart Define. 2015. "operative thesaurus" https://smartdefine.org/operative/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2015, operative thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/operative/thesaurus/antonyms>.
MLASmart Define. "operative thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/operative/thesaurus/antonyms>