IPA: /ˈswɛtɪnəs/
KK: /ˈswɛtɪnəs/
The condition of having a lot of sweat on the skin.
After running for an hour, the sweatiness made me feel uncomfortable.
Sweatiness is formed from "sweat" (from Old English *swæt*, meaning moisture or perspiration) and "-iness" (meaning the quality of being). The word "sweatiness" refers to the quality of being sweaty or having moisture on the skin.
Think of the Old English word for moisture, 'swæt', to remember that 'sweatiness' means the quality of being moist or sweaty.