| NOUN | attribute | inefficaciousness, inefficacy | a lack of efficacy |
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| Meaning | A lack of efficacy. | |
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| Synonym | inefficacy | |
| Broader | ineffectiveness, ineffectualness, ineffectuality | lacking the power to be effective |
| Opposite | efficacy, efficaciousness | Capacity or power to produce a desired effect |
| Adjectives | inefficacious | lacking the power to produce a desired effect |
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