Antonyms of noun inefficiency

1 sense of inefficiency

Sense 1
inefficiency -- (unskillfulness resulting from a lack of efficiency)
       Antonym of efficiency (Sense 2)
      => efficiency -- (skillfulness in avoiding wasted time and effort; "she did the work with great efficiency")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun inefficiency

1 sense of inefficiency

Sense 1
inefficiency -- (unskillfulness resulting from a lack of efficiency)
       => unskillfulness -- (a lack of cognitive skill)