Na-adjective (keiyodoshi), Adverb (fukushi), Adverb taking the 'to' particle
totally (immersed in something, e.g. liquid, work); addicted
Onomatopoeic or mimetic word
ころんでこえだめに落ち、頭からどっぷりと浸かってしまった。He fell into the cesspool and got covered from head to toe.