Usually means: Lack of desired or intended effectiveness.
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We found 22 dictionaries that define the word inefficacy:

General (20 matching dictionaries)
  1. inefficacy: Merriam-Webster
  2. inefficacy: Oxford Learner's Dictionaries
  3. inefficacy: American Heritage Dictionary of the English Language
  4. inefficacy: Collins English Dictionary
  5. inefficacy: Vocabulary.com
  6. inefficacy: Wordnik
  7. inefficacy: Wiktionary
  8. inefficacy: Webster's New World College Dictionary, 4th Ed.
  9. inefficacy: The Wordsmyth English Dictionary-Thesaurus
  10. Inefficacy, inefficacy: Dictionary.com
  11. inefficacy: Online Etymology Dictionary
  12. Inefficacy: Online Plain Text English Dictionary
  13. inefficacy: Webster's Revised Unabridged, 1913 Edition
  14. inefficacy: Rhymezone
  15. Inefficacy: AllWords.com Multi-Lingual Dictionary
  16. inefficacy: Webster's 1828 Dictionary
  17. inefficacy: FreeDictionary.org
  18. inefficacy: Mnemonic Dictionary
  19. inefficacy: TheFreeDictionary.com
  20. inefficacy: Infoplease Dictionary

Business (1 matching dictionary)
  1. inefficacy: Legal dictionary

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from Wiktionary (inefficacy)

▸ noun:  The condition of being ineffective

Similar:
inefficaciousness, ineffectiveness, inefficacity, ineffectivity, ineffectuality, inefficience, inefficiency, effectlessness, nonefficiency, impotentness, more...

Opposite:
efficacy, effectiveness, productivity, success

Adjectives:
political, total, relative, utter, personal, own, apparent, general, causal, complete, frequent
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Similar:
inefficaciousness, ineffectiveness, inefficacity, ineffectivity, ineffectuality, inefficience, inefficiency, effectlessness, nonefficiency, impotentness, more...

Opposite:
efficacy, effectiveness, productivity, success

Adjectives:
political, total, relative, utter, personal, own, apparent, general, causal, complete, frequent



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