乱

乱

Chaotic; messy; disorderly.

In this sentence, '乱' is used to mean 'messy' or 'disorganized', interpreting the physical state of the room.

这个房间太乱了，需要收拾一下。

This room is too messy; it needs to be tidied up.

Here, '乱' means 'carelessly' or 'recklessly', describing the manner of speaking that could lead to misunderstandings.

不要乱说话，会引起误会。

Do not speak carelessly; it might cause misunderstandings.

In this sentence, '乱' signifies 'chaotic' or 'disorderly', referring to the social conditions post war.

战争结束后，社会变得很乱。

After the war ended, society became chaotic.