In a manner that is full to the brim; abundantly; completely overflowing.
From 'brimful' or 'brimfull' (brim + full) plus the adverbial suffix '-ly' (Old English 'lice'). Forms an adverb from the adjective, describing actions done with complete abundance.
When something happens 'brimfully,' it's not just happening—it's overflowing with enthusiasm and completeness, like a glass that's not just full but about to spill over with joy!
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