← BackshareGuesssweltering/ˈswɛltərɪŋ/adjectiveExtremely hot and uncomfortable; causing sweating.The sweltering heat of the afternoon made everyone seek shade.Even with fans, the small room was sweltering in the summer sun.They canceled the picnic because of the sweltering weather.SynonymsboilingscorchingblazingAntonymsfreezingfrigid