"jolliest" in the adjective sense
1. gay, jocund, jolly, jovial, merry, mirthful
full of or showing high-spirited merriment
"when hearts were young and gay"
"a poet could not but be gay, in such a jocund company"- Wordsworth
"the jolly crowd at the reunion"
"jolly old Saint Nick"
"a jovial old gentleman"
"have a merry Christmas"
"peals of merry laughter"
"a mirthful laugh"
Source: WordNet® (An amazing lexical database of English)
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