maturely
In a responsible, calm, and thoughtful way, like an adult.
Maturely means acting with the thoughtfulness, responsibility, and self-control of someone older or more experienced than you actually are. When a ten-year-old handles disappointment maturely, they might take a deep breath and accept that they didn't make the team this year instead of throwing a tantrum. When someone responds maturely to criticism, they listen carefully and consider whether the feedback could help them improve, rather than getting defensive or making excuses.
Acting maturely often means putting aside what you want right now for something more important later. A student who maturely manages their time finishes homework before playing video games. Someone who behaves maturely in an argument stays calm and listens, even when they feel angry.
When adults say you handled something maturely, they're recognizing that you acted with wisdom beyond your years. Maturity isn't about age alone: a twelve-year-old can act more maturely than a twenty-year-old, depending on how they handle responsibility and treat others.