adjective
an adjective is a word that describes or modifies a noun or pronoun. In this case, 'sweltering' describes something that is extremely hot and causing discomfort.
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The sweltering heat wave caused a spike in electricity usage across the city.
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I can't stand this sweltering weather, it's too hot!
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This sweltering heat is killer, I need to find some shade.
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The tension in the room was sweltering, as everyone awaited the results of the election.