torrid
Extremely hot, like burning heat that feels unbearable.
Torrid describes heat so intense it feels overwhelming and oppressive. When weather forecasters warn of torrid summer conditions, they mean temperatures hot enough to make you sweat just standing still, hot enough that you want to stay inside where it's cool. The Sahara Desert experiences torrid heat, where the sun bakes everything beneath it.
The word carries a sense of extremity. A warm day is pleasant; a hot day is uncomfortable; but torrid heat is almost unbearable. You might read about explorers facing torrid conditions while crossing a desert, or athletes competing despite the torrid afternoon sun.
Torrid also describes intense emotion or activity, especially in a dramatic or overwhelming way. A basketball team might go on a torrid scoring streak, hitting shot after shot until the other team can barely keep up. A story might describe a torrid friendship or rivalry, meaning feelings so intense they consume the people involved.
The word suggests something burning hot, whether literally or figuratively. When something is torrid, it blazes with an intensity that's hard to ignore or escape.