used to mean the opposite of the stated quality

恰恰不;根本不;决不

You use anything but in expressions such as anything but quiet and anything but attractive to emphasize that something is not the case.

在anything but quiet和anything but attractive这样的表达中，你会使用anything but来强调某事并非如此，并非安静，并非有吸引力的。

She's meant to be really nice but she was anything but nice when I met her.

她确实是想对别人好，可是我和她碰面的时候，她真的不怎么样。