Swelteringly is an adverb that refers to a condition or situation that is extremely hot or uncomfortable. It is a word which denotes extreme warmth which often causes discomfort and exhaustion. Some synonyms for sweltering include scorching, searing, roasting, blazing, torrid, oppressive, stifling, sultry, heated, boiling, and blistering. Each of these adjectives emphasizes the intense level of heat or discomfort that one experiences. These synonyms can be used interchangeably in a sentence depending on the context, but each one of them has a distinct connotation that ideally describes the degree of heat in a specific scenario. Therefore, their use could vary depending on the intended meaning.