3
competently
3
efficiently
3
expeditiously
3
successfully(feature, state, characteristic)
2
ably
2
capably
1
adroitly
1
deftly
1
effectively
1
effectually
0
abundantly
0
accordingly
0
adeptly
0
adequately
0
almightily
0
appositely
0
appropriately
0
aptly
0
artfully
0
befittingly
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APASmart Define. (2015). inefficiently thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/inefficiently/thesaurus/antonyms
ChicagoSmart Define. 2015. "inefficiently thesaurus" https://smartdefine.org/inefficiently/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, inefficiently thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/inefficiently/thesaurus/antonyms>.
MLASmart Define. "inefficiently thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/inefficiently/thesaurus/antonyms>