Similar word to cheerful:

airy, animated, blithe, bouncy, bright, bucked, buoyant, cheery, chipper, chirpy, contented, effervescent, enlivening, enthusiastic, full of pep, gay, glad, gladsome, good-humored, good-natured, hearty, high, hilarious, hopeful, in good spirits, in high spirits, jaunty, jocund, jolly, joyful, lighthearted, lively, merry, optimistic, peppy, perky, pleasant, roseate, rosy, sanguine, snappy, sparkling, sprightly, sunny, sunny side up, up, upbeat, vivacious, winsome, zappy, zingy, zippy


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