欲求不満 英語で:

As I listened to his speech I felt increasing frustration.

I could ​sense his frustration at not being ​able to ​help. This ​job has more than ​its ​fair ​share of frustrations

Definition frustration is the feeling you have when there are problems which you cannot solve because you cannot control events

frustration and tension at work

There is, in fact, enormous frustration among Belgian railway workers.

His anger was born of frustration.

Isn't it better to get drunk and cut loose once in a while and blow off the tension of daily frustration?

You're not a serious mathematician unless you crumple up a piece of paper in frustration every twenty minutes, look off into space, and appear to be questioning your very existence.