Knowing that they could survive for only a short time in the merciless heat, Tom worked frantically to repair the thermostat.

During the merciless heat of noon one of the frailer females collapsed, far from any possible shelter.

The enormous red disk of Arkar, declining toward the horizon, poured down merciless heat.

Flames shot into the night sky, forcing Tristan and Arian to squeeze their eyes shut against the merciless heat.

A colourless world of black and white and merciless heat.

Dozens of people have died in the merciless heat since December, aid workers and hospital officials say, although the full death toll remains unclear.

Like any ordinary human being caught in the merciless heat of the desert, I needed water.

It was a long haul in merciless heat but worth every drop of perspiration.

I was exposed to the merciless heat of the glaring sun.

Searing, merciless heat hit him like a slap.