Answer:

merriest

AnswerCrossword Clue
MERRIESTMost like Windsor wives?
MERRIESTLike a most enjoyable Christmas?
MERRIESTMost jubilant
MERRIESTSuperlative for Christmas.
MERRIESTMost festive.
MERRIESTMost joyful
MERRIESTMost mirthful
MERRIESTMost gamesome
MERRIESTExtremely happy
MERRIESTJolly to the max
MERRIESTMirthful to the max
MERRIESTChristmas superlative