(adv.) In a manner or to a degree that can not be repressed.

affably agreeably airily amiably amicably blissfully blithely cheerily confidently cordially enjoyably expectantly fair fondly genially gladly graciously gratifyingly happily hopefully hopingly irrepressibly jauntily joyfully kindly lightly optimistically pleasantly pleasingly pleasurably sanguinely satisfyingly smilingly with good cheer