Mary felt the tension and fever increase to unbearable levels, and then her senses exploded.

Finally, as the tension built to unbearable levels he sighed.

It was well performed, and pitched at an unbearable level of twinkly oddity.

Now he must constantly be immersed in water or his Fire will reach unbearable levels.

An engineer had once told him the new generation of superfast engines screamed at unbearable levels.

For a motion picture with so little action, the suspense builds to almost unbearable levels.

Often tensions seem to build to an unbearable level, then suddenly ease.

The pain had grown to insane, unbearable levels and then abruptly ceased.

At one point the tension rises to unbearable levels for both and she forces him to leave, only to later realize that she needs him.

First of all, because it will only increase the suffering - already at unbearable levels - of the Cuban people.