Non-irritant refers to a substance or product that does not cause irritation to the skin or other body parts. Some antonyms for non-irritant include irritant, abrasive, harsh, caustic, and corrosive. An irritant is a substance that causes inflammation, itching, or redness on the skin or other surfaces it comes in contact with. Abrasive substances cause damage by rubbing, scraping, or wearing away the surface of an object or tissue. On the other hand, harsh, caustic, and corrosive substances are strong and damaging to the skin, causing chemical burns or other types of tissue damage. It is important to use non-irritant products to avoid any type of discomfort and skin damage.