Cheerier is an adjective that describes something or someone that is happy, lively, and full of energy. Synonyms for cheerier include more joyful, jollier, more animated, brighter, more upbeat, sunnier, more enthusiastic, more vivacious, and more buoyant. It could also be expressed as more bubbly, more chipper, more effervescent, more exuberant, more optimistic, more peppy, more positive, more radiant, more spirited, and more vibrant. Whether it's a person's personality, the weather outside, or a general atmosphere, using these synonyms for cheerier will liven up any situation.