Antonyms of adv inefficiently

1 sense of inefficiently

Sense 1
inefficiently -- (in an inefficient manner; "he dealt inefficiently with the crisis")
       Antonym of efficiently (Sense 1)
      => efficiently, expeditiously -- (with efficiency; in an efficient manner; "he functions efficiently")

Synonyms of adv inefficiently

1 sense of inefficiently

Sense 1
inefficiently -- (in an inefficient manner; "he dealt inefficiently with the crisis")