プログレッシブ和英中辞典(第4版)の解説
たいまん【怠慢】
neglect，《文》 negligence；〔義務などの不履行〕default
怠慢な negligent ((in, about))；《文》 neglectful ((of))
彼は職務怠慢で職を失った
He lost his job through [because of] negligence.
君は（職務）怠慢だ
《文》 You have been remiss (in your duties).／You have neglected [been negligent in] your duties.
利子不払いは彼の怠慢である
He has defaulted on his interest payments.