45 entries under limited topic. ×

16
incompetent(adjective, weak, ability, skill, awkward)
14
ineffectual(adjective, weak, skill, inadequate)
14
powerless(adjective, weak, skill, inferior, inadequate)
13
impotent(adjective, weak, skill, inferior, inadequate)
13
inefficient(adjective, weak, skill, inadequate)
13
inept(adjective, dull, weak, flat, slow)
10
inadequate(adjective, weak, skill, inferior)
4
futile(adjective, weak, inferior, inadequate)
4
worthless(adjective, inferior, inadequate, feeble)
3
inefficacious(adjective, skill, inferior, inadequate)
3
inoperative(adjective, skill, inferior, inadequate)
3
unavailing(adjective, weak, inferior, inadequate)
2
feeble(adjective, weak, inferior, inadequate)
2
fruitless(adjective, weak, inferior, inadequate)
2
inferior(inadequate, feeble, useless, vain)
2
useless(adjective, weak, inferior, inadequate)
1
abortive(inferior, inadequate, feeble, useless)
1
anticlimactic(inferior, inadequate, feeble, useless)
1
barren(adjective, weak, inferior, inadequate)
1
bootless(inferior, inadequate, feeble, useless)
<123>
10 years ago|12k views|share |citing 
APASmart Define. (2016). unable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unable thesaurus" https://smartdefine.org/unable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, unable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unable/thesaurus/synonyms>.
MLASmart Define. "unable thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/unable/thesaurus/synonyms>