The Adverb of Happiness is Happily.
Example Sentences of Happily
He was happily married.
They lived happily ever afterward.
She happily granted my request.
They have been happily married for thirteen years.
He lived there happily for a year.
Instead of feeling grieved over the inevitability of death, we should live happily and spread our joys everywhere.
They would make more money and live happily afterwards.
They happily do any service for us.
The people happily donated land for the school.
I hope we shall be able to live happily together.
They lived happily together.
His advice to take exams happily may stand in a good stead for me.