Synonyms|215Antonyms|56|Broader|0Narrower|0Related|93

21 entries under adjective topic. ×

5
efficacious(efficient, productive)
1
potent
1
powerful
1
strong
0
admirable
0
hefty
0
intense
0
operative
0
overbearing
0
profound
0
pure
0
real
0
reliable
0
rich
0
righteous
0
steadfast
0
stout
0
substantial
0
swingeing
0
valid
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APASmart Define. (2016). inefficacious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/inefficacious/thesaurus/antonyms
ChicagoSmart Define. 2016. "inefficacious thesaurus" https://smartdefine.org/inefficacious/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, inefficacious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/inefficacious/thesaurus/antonyms>.
MLASmart Define. "inefficacious thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/inefficacious/thesaurus/antonyms>