More uncheerful is a negative term that denotes a lack of joy and positivity. It is often used to describe a situation, mood or demeanor that is gloomy, depressing, sad, or unhappy. To find antonyms for the word more uncheerful, we need to look for the opposite or contrasting terms that denote happiness, positivity, and joy. Some of the antonyms for the word more uncheerful include cheerful, happy, joyful, optimistic, and upbeat. Other antonyms could be light-hearted, jolly, merry, blithesome, and bubbly. These antonyms can be used to describe a person, occasion or moment that is full of joy and positivity.