merrier , merriest
If you describe someone's character or behaviour as merry, you mean that they are happy and cheerful.
From the house come bursts of merry laughter.
从房子里传出阵阵欢快的笑声。
Merry Christmas
Just before Christmas and on Christmas Day, people say 'Merry Christmas' to other people to express the hope that they will have a happy time.
Merry Christmas, everyone.
祝大家圣诞快乐。