Usually means: Not producing the desired effect.
Definitions Related words Mentions History
We found 20 dictionaries that define the word inefficacious:

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

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

(Note: See inefficaciously as well.)

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Definitions from Wiktionary (inefficacious)

▸ adjective:  Incapable of having the intended consequence.
▸ adjective:  Not effective.

Similar:
ineffectual, inefficient, ineffective, unefficacious, nonefficacious, ineffectible, uneffectual, futile, noneffectual, ineffectuall, more...

Opposite:
efficacious, effective, efficaciousness

▸ Words similar to inefficacious

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▸ Popular nouns described by inefficacious

▸ Words that often appear near inefficacious

▸ Rhymes of inefficacious

▸ Invented words related to inefficacious

Similar:
ineffectual, inefficient, ineffective, unefficacious, nonefficacious, ineffectible, uneffectual, futile, noneffectual, ineffectuall, more...

Opposite:
efficacious, effective, efficaciousness



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