Answer:

merrier

Answer	Crossword Clue
MERRIER	More full of good cheer
MERRIER	Less gloomy
MERRIER	Not as cheerless

MERRIER	More jovial.
MERRIER	The more the ....
MERRIER	More, it's sometimes said
MERRIER	"The more the ..."
MERRIER	More cheerful around the holidays, say
MERRIER	More cheery
MERRIER	More, in an expression?
MERRIER	More festive