Synonyms|1.1kAntonyms|339|Broader|13Narrower|39Related|1k
2
futile
2
unavailing
2
unimportant
2
vain
2
baneful
2
capricious
2
not helpful
2
otiose
2
unprofitable
2
unsuccessful
1
unreal
1
ancillary
1
blighted
1
conjectural
1
counteractive
1
counterproductive
1
dependent(adjective, strong, power, valid, legal)
1
fabricated
1
fake
1
fictional
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APASmart Define. (2015). effective thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/effective/thesaurus/antonyms
ChicagoSmart Define. 2015. "effective thesaurus" https://smartdefine.org/effective/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, effective thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/effective/thesaurus/antonyms>.
MLASmart Define. "effective thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/effective/thesaurus/antonyms>