Proliferative bronchiolitis is a medical condition that causes inflammation and damage to the small airways in the lungs. However, it's essential to know that several antonyms exist for the term "proliferative bronchiolitis." For instance, a few antonyms for "proliferative" include decreasing, decreasingly, dwindling, and waning, while some antonyms for "bronchiolitis" might be bronchodilator, bronchodilation, or bronchospasm. These antonyms illustrate the opposite of the term "proliferative bronchiolitis," which is characterized by inflammation, damage, and airway constriction.