The term efficacious means effective or producing the desired result. The opposite of this word is "ineffective," which means lacking in effectiveness or ability to produce a desired result. Other antonyms for efficacious include "inefficacious," "inefficient," and "fruitless." These words highlight the opposite of successful results or effectiveness of an action. Additionally, the phrase "not effective" can also serve as an antonym for "is efficacious." When attempting to convey a lack of success, the antonyms for "is efficacious" provide a range of options to convey a lack of desired outcomes.

What are the antonyms for Is 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
  .

Tiebreak, synonymous with "overtime" or simply "sudden death," is a term used predominantly in sports to determine a winner in a situation where the game ends in a tie. Other relat...