jolliest
jol-li-est
adjective
The most cheerful, merry, and full of fun or good humour.
"He was the jolliest man at the Christmas party."
Thesaurus
Synonyms: jolly, jolly boat, mirthful, merry, jovial, joyous, jocund, gay, chaff, kid, josh, banter
Antonyms: immoderately, unreasonably