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

72 entries under adjective topic. ×

6
powerless(weak, skill, inadequate, useless)
5
incompetent(weak, skill, inadequate, feeble)
5
unable(skill, inferior, inadequate, limited)
5
unprofitable(inferior, inadequate, feeble, useless)
4
idle(inferior, inadequate, feeble, useless)
4
lame(inferior, inadequate, limited, feeble)
4
pointless
4
uneffective
4
unfruitful(inadequate, feeble, useless, vain)
3
failed
3
feeble(inadequate, useless, incompetent, vain)
3
forceless(inferior, inadequate, limited, feeble)
3
impractical(unreasonable, unrealistic, unpractical, unviable)
3
indecisive(inferior, inadequate, limited, feeble)
3
inept(weak, skill, inadequate, feeble)
3
paltry(inferior, inadequate, useless, trivial)
3
profitless
3
sterile
2
hopeless(useless, vain, ineffective, unsuccessful)
2
inferior(inadequate, limited, feeble, useless)
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ChicagoSmart Define. 2016. "inefficacious thesaurus" https://smartdefine.org/inefficacious/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, inefficacious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/inefficacious/thesaurus/synonyms>.
MLASmart Define. "inefficacious thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/inefficacious/thesaurus/synonyms>