Difference between Happily and Mirthfully

HAPPILY vs MIRTHFULLY: ADVERB

In a joyous manner
In an unexpectedly lucky way
With address or dexterity; gracefully; felicitously; in a manner to insure success; with success.
By chance; perhaps.
By good chance; fortunately, successfully.
In a happy or cheerful manner; with happiness.
With good will; in all happiness; willingly.
In a happy manner or state; in happy circumstances.

By good fortune; fortunately; luckily.
In a happy or pleasing way or state; in pleasant or fortunate circumstances; with happiness or joy.
With address, skill, dexterity, or aptness; dexterously; felicitously; aptly; gracefully.
By chance; peradventure; haply.
Synonyms Haply, Happily. Haply, now rarely used in prose, means by chance; happily, by a happy chance.
Prosperously, successfully, contentedly.

Comfortably, Pleasantly, Quietly, Gaily, Willingly, Enthusiastically, Gladly, Cheerfully, Joyfully, With happiness, Gayly, Mirthfully, Jubilantly, Blithely, Merrily

Imploringly, Superciliously, Humourously, Girlishly, Saucily, Naughtily, Roguishly, Puckishly, Lugubriously, With happiness, Jubilantly, Merrily, Happily, Blithely, Gayly

Delightfully, Seamlessly, Happier, Happy, Readily, Comfortably, Pleasantly, Quietly, Gaily, Willingly, Gladly, Gayly, Mirthfully, Blithely, Merrily

Filthily, Tremulously, Amusedly, Evilly, Winsomely, Imploringly, Superciliously, Girlishly, Saucily, Naughtily, Roguishly, Lugubriously, Merrily, Blithely, Gayly

We are both happily starting the maintenance program.
You can definitely barhop happily on that street.
Brazil heist finally living happily and in peace.
Gobble them down happily along with your coworkers.
Shayna grew up dreaming about happily every after.
Politely say no and live your life happily.
We will happily recommend you at any opportunity.
Williams and Dunst, happily, are the real stars.
He happily gave up everything for us and when we realized this we happily give up everything for him.
There are enough retailers out there that will happily accommodate their customers and I will happily patronize them!

While the surprise element mirthfully consternates the opposition, it also brews political storms that derail stability and undermine progress.
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