"infernal heat" is a perfectly acceptable phrase to use in written English.
It is often used to describe extremely hot weather or conditions and conveys a sense of discomfort or distress. For example, you could say "The infernal heat was unbearable, making it impossible to focus on anything but the oppressive temperature."
In a 2003 review of bands from the past, Latin Beat magazine wrote of "the infernal heat radiated" by the Campo band.
Muscovites still find time for traditional pleasures like the baths -- infernal heat, icy water, slap of birch twigs followed by beer and red caviar sandwiches on buttered bread.
But Ms. Marks's wings were wilting in the infernal heat, and all around her people with clothes stuck to their torsos and mascara running down their cheeks struggled to look cool.
He is still here today, enduring infernal heat and fetid quarters in the ransacked headquarters of Iraq's Interior Ministry, as much of the Third Infantry Division remains in the city it helped conquer, interacting with people it once saw as the enemy.
To tame that fire, to master the tandoor — to cook meat to temperature (meats are cooked on metal skewers that stand in the middle of the oven), to bake breads without burning them (breads are stuck to the oven wall, where they go from dough to done in no time flat), and to expose your mitts to that infernal heat night in, night out — is no mean feat.
"I told them you don't want to go that way right now," Juarez said, what with the few gas stations -- and the infernal heat.
The heat was infernal; I wished I had worn my sundress, but it was in the wash.
(He did not have to assemble any furniture with those infernal hex wrenches).
Michael Dominick's infernal constructions of recycled radiators pump heat into the space, pushing it to the limit of tolerance.
A slave kitchen was an alarming place, where a whoosh of flame was likely to roast the cook along with the meat, and the heat and smoke were infernal.
The producer, Adam Marks from Cumbria, is a self-confessed chilli addict (he also makes infernal concoctions with super-hot naga peppers) but here the heat levels are more manageable.
