| Word | Definitions | Synonyms |
|---|---|---|
| efficaciously | (adverb) in an effective manner | Synonyms: effectively |
| efficiently | (adverb) with efficiency; in an efficient manner | Synonyms: expeditiously |
| inefficaciously | (adverb) in an ineffective manner | Synonyms: ineffectively |
| inefficiently | (adverb) in an inefficient manner | - |