Mildew is a common problem in damp and humid environments, and it can cause unpleasant odors and unsightly discoloration on fabrics, walls, and other surfaces. The antonyms for the word "most mildewy" are related to cleanliness, freshness, and purity. Some possible antonyms include sterile, hygienic, immaculate, spotless, pristine, unsoiled, pure, clean, neat, and untainted. These descriptors suggest an absence of mildew or other contaminants and a focus on a clean and healthy environment. By using antonyms for "most mildewy," we can emphasize the importance of cleanliness and hygiene in preventing and eliminating mildew growth.