Definition
Describes a state where someone is being unfriendly or angry, which is typical for them.
心情不好（特别是指常愤怒或不友善）
She's in one of her moods today; it's best not to bother her.
她今天又开始闹脾气了，最好别去打扰她。
The boss is in one of his moods today, so everyone is being very careful at work.
老板今天心情不好，所以大家在工作时都非常小心。
I know he gets like this sometimes, but it's best to avoid him when he's in one of his moods.
我知道他有时会这样，但当他心情不好时，最好避开他。