dud

Adjective

• failing to detonate; especially not charged with an active explosive
  • he stepped on a dud mine
    

Noun

• an event that fails badly or is totally ineffectual
  • the first experiment was a real turkey
    
  • the meeting was a dud as far as new business was concerned
    

• an explosion that fails to occur

• someone who is unsuccessful

Related words

• Synonyms: 
  turkey , bomb , misfire , flop , washout