"心情不爽"在英语中可以说为"in a bad mood". 这个表达来源于拉丁语，"mood"在拉丁语中意思是"心情"或"情绪"，而"bad"意思是"不好的"或"坏的"。

例句:

I'm in a bad mood today. 我今天心情不爽。

She's been in a bad mood since she woke up. 她从醒来就心情不爽。

He's been in a bad mood all week. 他整个星期都心情不爽。