sweltering
adjective (from the verb swelter)

- extremely and uncomfortably hot

verb
-  to feel very hot

The Cambridge Dictionary

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WORD ORIGIN

“Sweltering” (adjective) and “swelter” (verb) are derived from the Old English swelten meaning to be fatigued, especially from heat. Sweltering thus describes weather temperature that is uncomfortably and tiringly hot.

DON'T CONFUSE "swelter" with the noun “welter” which means “a large and especially badly organized number of things” as in “We are reducing the company’s welter of development projects and will streamline sales and marketing.”

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AS HOT AS WHAT?

- as hot as hell

- as hot as it gets

- as hot as Hades

- as hot as a toast

- as hot as a furnance

- as hot as a branding iron

- as hot as the devil’s kitchen

- as hot as a junkie’s teaspoon

- as hot as a car seat in summer

- as hot as a cat on a hot tin roof

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SYNONYMS

- oppressively hot and humid

baking / blazing / blistering / boiling / broiling / burning / fiery / flaming / roasting / scalding / scorching (hot), equatorial, hot and humid, hot and sticky, incandescent, jungle-like, like a blowtorch (furnace, oven, sauna, a Turkish bath), muggy, oven-like, parched, scorched, scorching, searing, sizzling, sultry, SWELTERING, toasted, torrid, tropical, ultra-hot, unbearably hot, white-hot, withering

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SMUGGLE OWAD into an English conversation, say something like:

“They won’t get much work done in this SWELTERING heat.”

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