dud

noun

an event that fails badly or is totally ineffectual
ひどく失敗したり、まったく無駄なこと
- the first experiment was a real turkey
  最初の実験はまったくの失敗だった
- the meeting was a dud as far as new business was concerned
  新ビジネスに関する限りその集まりは失敗だった
an explosion that fails to occur
起こらなかった爆発
someone who is unsuccessful
失敗した人

adjective

failing to detonate
爆発しないさま

especially not charged with an active explosive
特に活性爆薬で充満していない
- he stepped on a dud mine
  彼は、不発の地雷を踏んだ

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