the way someone thinks or feels about something at a particular time

The most important thing is to go into the exam in a positive frame of mind. 最重要的是要以积极的心态参加考试。

When you have that sort of defeatist frame of mind, you inevitably think that nothing will work out.

I'm in a much better frame of mind than when you last saw me.

It's like any training - you have to be in the right frame of mind to benefit from it.

This is not a good frame of mind for anyone to be in.

I must ask - given your frame of mind at the time, do you think you acted improperly?

See also: frame noun (STRUCTURE)