Synonyms|391Antonyms|160|Broader|4Narrower|7Related|1k
8
efficient(adjective, weak, sound, delicate, competent)
7
impactful
6
competent(adjective, sound, insufficient, inept, able)
6
cost-effective(adjective, non profit, Non Profit)
6
effective(adjective, weak, sound, inadequate, competent)
5
useful(adjective, sound, competent)
4
cost effective
4
successful
3
able(adjective, sound, competent)
3
businesslike(adjective, efficient, professional)
3
capable(adjective, sound, competent)
3
economic
3
economical
3
effectual
3
efficacious(adjective, efficient, productive)
3
expeditious
3
expert(adjective, sound, competent)
3
hands-on
3
productive
3
realistic
<12345…8>
For more, visit Inefficient on Power Thesaurus
10 years ago|2.1k views|share |citing 
APASmart Define. (2015). inefficient thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/inefficient/thesaurus/antonyms
ChicagoSmart Define. 2015. "inefficient thesaurus" https://smartdefine.org/inefficient/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, inefficient thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/inefficient/thesaurus/antonyms>.
MLASmart Define. "inefficient thesaurus" 12 November 2015. Web. 22 September 2026. <https://smartdefine.org/inefficient/thesaurus/antonyms>