\Wind"i*ness\, n. 1. The quality or state of being windy or tempestuous; as, the windiness of the weather or the season. 2. Fullness of wind; flatulence. 3. Tendency to generate wind or gas; tendency to produce flatulence; as, the windiness of vegetables. 4. Tumor; puffiness. The swelling windiness of much knowledge. --Brerewood.