Procrastination, Carelessness
Noun, な adjective, and の adjective
たいまん
それは警察の怠慢なんじゃないんですか。
Isn’t that police negligence?
You ignore everything around you because you are lazy with laziness. That's too much lazy for one person so you're prone to negligence and procrastination. You definitely can't manage to take care of things when you're this lazy.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.