Antonyms for the phrase "was efficacious" would be words that convey a lack of effectiveness or success. Words like ineffective, futile, useless, and unproductive are antonyms for the phrase. Additionally, words like unsuccessful, pointless, and nonproductive could also be considered antonyms. When a treatment or medicine is not effective, we might use words like inadequate or fruitless to describe it. Similarly, when a plan or strategy does not bring about the desired results, we might use words like unsuccessful or unproductive. It is important to consider antonyms for phrases like "was efficacious" to accurately convey the lack of effectiveness in a certain situation.

What are the antonyms for Was efficacious?

• v.

  • take
  • abstain
  ,
  • add
  ,
  • avoid
  ,
  • be honest
  ,
  • be immune
  ,
  • disallow
  ,
  • discontinue
  ,
  • disenchant
  ,
  • dodge
  ,
  • fail
  ,
  • give
  ,
  • hold
  ,
  • keep
  ,
  • lose
  ,
  • maintain
  ,
  • misconceive
  ,
  • misunderstand
  ,
  • offer
  ,
  • receive
  ,
  • refuse
  ,
  • reject
  ,
  • repulse
  ,
  • stop
  .

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