Inefficacy Synonyms and Antonyms

ĭn-ĕfĭ-kə-sē
The condition or state of being incapable of accomplishing or effecting anything
(Noun)
Synonyms:
  1. helplessness
  2. impotence
  3. inadequacy
  4. incapability
  5. ineffectiveness
  6. inefficaciousness
  7. ineffectuality
  8. ineffectualness
  9. powerlessness
  10. uselessness
Antonyms:
  1. efficacy