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Noun: inefficacy  in'e-fu-ku-see
  1. A lack of efficacy
    - inefficaciousness

Derived forms: inefficacies

Type of: effeteness, ineffectiveness, ineffectuality, ineffectualness, wetness [Brit, informal]

Antonym: efficacy

Nearest

ineffective
ineffectively
ineffectiveness
ineffectual
ineffectuality
ineffectually
ineffectualness
inefficacious
inefficaciously
inefficaciousness
inefficacy
inefficiency
inefficient
inefficiently
inelaborate
inelastic
inelasticity
inelegance
inelegant
inelegantly
ineligibility