When talking about chemistry, the term "un-ionized" refers to a substance which has not lost or gained any electrons. Synonyms for this term include non-ionized, neutral, or noncharged. Non-ionized substances are typically less reactive than ionized ones, and this can have important implications in fields such as medicine and environmental science. Additionally, understanding how to measure levels of un-ionized substances is important for understanding the behavior of chemicals in the environment and in the human body. By using synonyms such as noncharged or neutral, we can better communicate the important scientific concepts surrounding un-ionized substances to a broader audience.