remiss

adjective

failing in what duty requires
義務が要求するものが不足しているさま
- derelict (or delinquent) in his duty
  彼の任務を放棄する（あるいは、怠る）
- neglectful of his duties
  彼の任務に怠慢な
- remiss of you not to pay your bills
  自分の勘定を支払わないとはいいかげんな

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