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Adjective: inefficacious  `inefu'keyshus
  1. Lacking the power to produce a desired effect
    "laws that are inefficacious in stopping crime"

See also: efficaciousness, efficacy, ineffective, ineffectual, inefficaciously, inefficaciousness, uneffective

Antonym: efficacious

Nearest

ineffably
ineffaceable
ineffaceably
ineffective
ineffectively
ineffectiveness
ineffectual
ineffectuality
ineffectually
ineffectualness
inefficacious
inefficaciously
inefficaciousness
inefficacy
inefficiency
inefficient
inefficiently
inelaborate
inelastic
inelasticity
inelegance