| ADJECTIVE | all | inefficacious | lacking the power to produce a desired effect |
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| Meaning | lacking the power to produce a desired effect. | |
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| Example | "laws that are inefficacious in stopping crime" | |
| Attribute of | efficacy, efficaciousness | Capacity or power to produce a desired effect |
| See also | ineffective, uneffective, ineffectual | not producing an intended effect |
| Opposite | efficacious | marked by qualities giving the power to produce an intended effect |
| Spanish | ineficaz | |
| Nouns | inefficaciousness | a lack of efficacy |
| Adverbs | inefficaciously | in an ineffective manner |
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