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Ineffaceably
Ineffectible
Ineffective
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Ineffervescence
Ineffervescent
Ineffervescibility
Ineffervescible
Inefficacious
Inefficaciously
Inefficaciousness
-- Inefficacy --
Inefficiency
Inefficient
Inefficiently
Inelaborate
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ineluctability
Ineluctable

Inefficacy

In`ef´fi`ca`cy
n.1.Lack of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means.
The seeming inefficacy of censures.
- Bp. Hall.
The inefficacy was soon proved, like that of many similar medicines.
- James Gregory.
Noun1.inefficacy - a lack of efficacy
Antonyms:
efficaciousness, efficacy - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine"
efficaciousness, efficacy, ineffectiveness, ineffectuality, ineffectualness, inefficaciousness

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