I think they came as the result of endless frustrations.

For the police, it was a source of endless frustration.

That call, which took place recently, captured in just a few minutes the wonderful convenience and endless frustration of the newest technology to hit the telephone market.

The endless frustration was snapped.

Composing, by contrast, inspired a certain terror in him, and the theatre world caused him endless frustration.

The only bad one I remember was not too bad, but simply endless frustration.

In the meantime, scientists who simply want to know if their experimental drugs work in animals say they are facing endless frustration.

"That's a source of endless frustration on our block."

That was all he would ever be to most people, to Caliban's endless frustration.

The stories are hard to follow; the cases have a nagging habit of remaining unsolved; the characters endure endless frustration, betrayal and mismanagement.