| coefficient | (noun) a constant number that serves as a measure of some property or characteristic | - |
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| efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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| (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
| efficaciously | (adverb) in an effective manner | Synonyms: effectively |
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| efficaciousness | (noun) capacity or power to produce a desired effect | Synonyms: efficacy |
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| efficacy | (noun) capacity or power to produce a desired effect | Synonyms: efficaciousness |
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| efficiency | (noun) skillfulness in avoiding wasted time and effort | - |
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| (noun) the ratio of the output to the input of any system | - |
| efficient | (adjective) being effective without wasting time or effort or expense | - |
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| (adjective) able to accomplish a purpose; functioning effectively | Synonyms: effective |
| efficiently | (adverb) with efficiency; in an efficient manner | Synonyms: expeditiously |
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| effigy | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: image, simulacrum |
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| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| inefficaciously | (adverb) in an ineffective manner | Synonyms: ineffectively |
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| inefficaciousness | (noun) a lack of efficacy | Synonyms: inefficacy |
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| inefficacy | (noun) a lack of efficacy | Synonyms: inefficaciousness |
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| inefficiency | (noun) unskillfulness resulting from a lack of efficiency | - |
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| inefficient | (adjective) not producing desired results; wasteful | - |
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| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: ineffective |
| inefficiently | (adverb) in an inefficient manner | - |
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