The term 'more cheerful' can be described by four different words: jollier (7 letters), chirpier (8 letters), gayer (5 letters) and rosier (6 letters). Jollier means to be full of joy and good humor, while chirpier implies being more lively and talkative. Gayer is a synonym for happier and rosier suggests having a brighter outlook on life. All four words describe a person who is more cheerful than before.