Word:

Inefficacious

In`ef`fi`ca´cious
a.1.Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent.
Adj.1.inefficacious - lacking the power to produce a desired effect; "laws that are inefficacious in stopping crime"
Antonyms:
efficacious - marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
efficacious, efficaciousness, efficacy, ineffective, ineffectual, uneffective
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Ineffableness
Ineffably
Ineffaceable
Ineffaceably
Ineffectible
Ineffective
Ineffectively
Ineffectiveness
Ineffectual
Ineffectuality
Ineffectually
Ineffectualness
Ineffervescence
Ineffervescent
Ineffervescibility
Ineffervescible
-- Inefficacious --
Inefficaciously
Inefficaciousness
Inefficacy
Inefficiency
Inefficient
Inefficiently
Inelaborate
Inelastic
Inelasticity
Inelegance
Inelegant
Inelegantly
Ineligibility
Ineligible
Inelligibly
Ineloquent
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