1.
negligence; neglect; procrastination; laziness in duty
Failure to carry out one's duties or responsibilities properly due to laziness or carelessness. Often used in formal or professional contexts as a criticism.
職務怠慢だ。
That is neglect of duty.
Usage
Used both as a noun (怠慢) and as a na-adjective (怠慢な). Very common in the compound 職務怠慢 (neglect of duty), which is a formal accusation in workplaces and government.