30 entries under inferior topic. ×

15
useless(adjective, wild, affect, inadequate)
14
bootless(adjective, inadequate, useless, trivial)
14
unavailing(adjective, inadequate, useless, trivial)
13
vain(adjective, inadequate, feeble, useless)
12
fruitless(adjective, inadequate, useless, trivial)
12
futile(adjective, inadequate, feeble, useless)
10
inefficient(adjective, weak, skill, affect)
10
inoperative(adjective, weak, skill, inadequate)
10
unsuccessful(adjective, inadequate, limited, feeble)
9
abortive(adjective, inadequate, useless, trivial)
8
impotent(adjective, weak, skill, inadequate)
8
nugatory(adjective, inadequate, feeble, useless)
7
feckless(adjective, inadequate, limited, feeble)
7
worthless(adjective, inadequate, useless, trivial)
6
null(adjective, inadequate, feeble, useless)
5
unable(adjective, skill, inadequate, limited)
5
unprofitable(adjective, inadequate, feeble, useless)
4
idle(adjective, inadequate, feeble, useless)
4
lame(adjective, inadequate, limited, feeble)
3
forceless(adjective, inadequate, limited, feeble)
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APASmart Define. (2016). inefficacious thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/inefficacious/thesaurus/synonyms
ChicagoSmart Define. 2016. "inefficacious thesaurus" https://smartdefine.org/inefficacious/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, inefficacious thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/inefficacious/thesaurus/synonyms>.
MLASmart Define. "inefficacious thesaurus" 24 March 2016. Web. 30 September 2026. <https://smartdefine.org/inefficacious/thesaurus/synonyms>