Becoming cheerful is the state of feeling happy and content. However, there may be certain circumstances that lead to the opposite feelings. Some antonyms for becoming cheerful may include feeling unhappy or sad, gloomy or melancholic, troubled or disturbed, anxious or worried, angry or annoyed, and frustrated or irritated. These states of mind can be a result of various factors such as personal problems, stressful situations, or illness. But one can always strive to overcome such negative emotions by cultivating positive habits, seeking help from loved ones, and practicing mindfulness techniques. By doing so, one can gradually transform into a cheerful and positive person.