The word "un alleviated" means that something is not relieved or improved. So, antonyms for this word will describe something that is less severe or something that is improved. Some of the antonyms for "un alleviated" are mitigated, diminished, relieved, lessened, alleviated, healed, cured, improved, treated, and aided. These antonyms can be used to describe a situation or a condition that has been improved over time. For example, the pain in his back was alleviated with some medication. Another example, a mitigated issue is something that is not as severe as it was before.