Adj. | 1. | sweltering - excessively hot and humid or marked by sweating and faintness; "a sweltering room"; "sweltering athletes" hot - used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning; "hot stove"; "hot water"; "a hot August day"; "a hot stuffy room"; "she's hot and tired"; "a hot forehead" |