Sweatiness is an uncomfortable state that many people experience when their skin pores open up and release sweat. The synonyms for sweatiness are perspiration, moisture, dampness, humidity, and clamminess. Perspiration refers to the fluid that is secreted from the sweat glands. Moisture and dampness refer to wetness that arises due to the presence of moisture in the air or on a surface. Humidity refers to the amount of water vapor in the air, which causes people to sweat more. Finally, clamminess refers to a particularly unpleasant form of sweatiness, where the skin feels cold and moist, almost as if coated in a layer of slime.