The word "disimproving" means getting worse or declining. Antonyms for disimproving would be improving, advancing, getting better, progressing, developing, and growing. These words indicate a positive trend or upward movement in a situation. For instance, when we talk about the economy, the antonym for disimproving would be improving or progressing. Similarly, in terms of health, the antonym for disimproving would be growing or getting better. In other words, antonyms for disimproving would be words that suggest an improvement or positive change. They are words that can be used to describe a favorable outcome, growth, or progress.