Synonyms|412Antonyms|83|Broader|4Narrower|1Related|376

33 entries under adjective topic. ×

1
non-beneficial(effect, result, outcome)
0
dependent(strong, power, valid, legal)
0
hopeless
0
inadequate
0
inappropriate
0
inapt
0
incomplete
0
inept
0
insufficient
0
poor
0
powerless
0
shiftless
0
unsound
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APASmart Define. (2015). efficacious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/efficacious/thesaurus/antonyms
ChicagoSmart Define. 2015. "efficacious thesaurus" https://smartdefine.org/efficacious/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, efficacious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/efficacious/thesaurus/antonyms>.
MLASmart Define. "efficacious thesaurus" 13 October 2015. Web. 23 September 2026. <https://smartdefine.org/efficacious/thesaurus/antonyms>