heavily

adverb

with a great weight or burden: a heavily loaded wagon.
in a manner suggestive of carrying a great weight; ponderously; lumberingly: He walked heavily across the room.
in an oppressive manner: Cares weigh heavily upon him.
severely; greatly; intensely: to suffer heavily.
densely; thickly: heavily wooded.
in large amounts or in great quantities; very much: It rained heavily on Tuesday.
without animation or vigor; in a dull manner; sluggishly.

adv.

Old English hefiglice “violently, intensely; sorrowfully; sluggishly,” from hefig (see heavy) + -ly (2).