sweltering

This term describes a specific type of heat that feels heavy and suffocating, typically combining high temperature with high humidity. It evokes a physical sensation of perspiration and lethargy, suggesting an environment where the air feels thick and difficult to breathe. While words like hot or scorching focus on the intensity of temperature, this word emphasizes the oppressive nature of the atmosphere. It is almost exclusively used in a negative or uncomfortable context, describing weather or indoor environments that drain a person's energy.