Synonyms|391Antonyms|160|Broader|4Narrower|7Related|1k
2
active
2
cost-efficient
2
good
2
helpful
2
high-octane
2
practical(adjective, unreasonable, unsound, experienced, proficient)
2
proficient(green, incompetent)
2
profitable
2
skillful(adjective, sound, awkward, competent, incompetent)
2
streamlined
2
worthwhile
2
wow
1
ace
1
adept
1
adequate
1
aerodynamic
1
availing
1
beneficial
1
expedient
1
fruitful
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APASmart Define. (2015). inefficient thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/inefficient/thesaurus/antonyms
ChicagoSmart Define. 2015. "inefficient thesaurus" https://smartdefine.org/inefficient/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, inefficient thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/inefficient/thesaurus/antonyms>.
MLASmart Define. "inefficient thesaurus" 12 November 2015. Web. 24 September 2026. <https://smartdefine.org/inefficient/thesaurus/antonyms>