futile

Adjective

• unproductive of success
  • a fruitless search
    
  • futile years after her artistic peak
    
  • a sleeveless errand
    
  • a vain attempt
    

• producing no result or effect
  • a futile effort
    
  • the therapy was ineffectual
    
  • an otiose undertaking
    
  • an unavailing attempt
    

Related words

• Synonyms: 
  bootless , fruitless , sleeveless , vain , ineffectual , otiose , unavailing