sweltering-hot
unbearably-hot

The room was unbearably hot, and the men were half blinded by the intensity of the light.

The ceiling fans were not working well and the hall was getting unbearably hot.

During those summers, some of the nights were unbearably hot.

If you think it's been unbearably hot this summer, don't feel too sorry for yourself.

As they stepped away from the stairs, the air became unbearably hot and thick.

The heat could make metal unbearably hot to touch in less than a quarter of an hour.

It was becoming unbearably hot in here and no longer could he see outside.

The climate throughout the year is warm but never unbearably hot.

My skin was unbearably hot, I longed for the cool air.

For much of last winter, broken heat controls left their apartment unbearably hot.