"merrier" 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"
2. gay, festal, festive, merry
offering fun and gaiety
"a festive (or festal) occasion"
"gay and exciting night life"
"a merry evening"
3. alert, brisk, lively, merry, rattling, snappy, spanking, zippy
quick and energetic
"a brisk walk in the park"
"a lively gait"
"a merry chase"
"traveling at a rattling rate"
"a snappy pace"
"a spanking breeze"
Source: WordNet® (An amazing lexical database of English)
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