32 entries under wasteful topic. ×

25
inept(adjective, weak, ability, inadequate, limited)
24
incompetent(adjective, weak, ability, thin, delicate)
24
ineffective(adjective, failure, affect, useless, well)
21
ineffectual(adjective, weak, thin, delicate, failure)
16
incapable(adjective, weak, ability, inadequate, feeble)
16
useless(adjective, weak, failure, inferior, affect)
14
feeble(adjective, strong, weak, inadequate, useless)
14
unfit(adjective, weak, ready, inadequate, well)
14
unskilled(adjective, weak, ability, inadequate, useless)
11
inexpert(adjective, weak, ability, inadequate, well)
10
inefficacious(adjective, weak, skill, inferior, affect)
10
unqualified(adjective, well, educated, overall, well-informed)
7
unskillful(adjective, ability, inadequate, useless, well)
6
careless(adjective, well, extravagant, incompetent, lavish)
6
extravagant(adjective, well, incompetent, lavish)
6
slipshod(adjective, well, incompetent, unproductive)
5
disorganized(adjective, well, incompetent, inept)
5
faulty(adjective, weak, feeble, well, incompetent)
5
improvident(adjective, well, extravagant, incompetent, lavish)
5
untrained(adjective, inadequate, useless, well, incompetent)
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APASmart Define. (2015). inefficient thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/inefficient/thesaurus/synonyms
ChicagoSmart Define. 2015. "inefficient thesaurus" https://smartdefine.org/inefficient/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, inefficient thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/inefficient/thesaurus/synonyms>.
MLASmart Define. "inefficient thesaurus" 12 November 2015. Web. 27 September 2026. <https://smartdefine.org/inefficient/thesaurus/synonyms>