Synonyms|215Antonyms|56|Broader|0Narrower|0Related|93
7
impactful
5
efficacious(adjective, efficient, productive)
2
effective
1
active
1
effectual
1
potent
1
powerful
1
strong
0
adequate
0
admirable
0
applicable
0
avail
0
availing
0
beneficial
0
deadly
0
efficient
0
expedient
0
feasible
0
fruitful
0
functional
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APASmart Define. (2016). inefficacious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/inefficacious/thesaurus/antonyms
ChicagoSmart Define. 2016. "inefficacious thesaurus" https://smartdefine.org/inefficacious/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, inefficacious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/inefficacious/thesaurus/antonyms>.
MLASmart Define. "inefficacious thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/inefficacious/thesaurus/antonyms>