On downer is a phrase used to describe a situation or state of mind that is sad, depressing, or pessimistic. Some antonyms for the term would be happy, uplifting, joyful, optimistic, and enthusiastic. If you're feeling on downer, you might try to think positive thoughts or do something to lift your spirits. You could listen to music that makes you feel happy or spend time with friends who make you laugh. Focusing on the good things in your life can help you feel more uplifted and hopeful. So, instead of dwelling on negative thoughts or feelings, try to find ways to inject some positivity into your day.