Adverb
In a heavy manner; with great weight; as, to bear heavily on a thing; to be heavily loaded.
As if burdened with a great weight; slowly and laboriously; with difficulty; hence, in a slow, difficult, or suffering manner; sorrowfully.
Source: Webster's dictionaryDo not make best friends with a melancholy sad soul. They always are heavily loaded, and you must bear half. François Fénelon
Modern economics and the welfare state borrowed heavily on the future. Gregory Benford
Progress everywhere today does seem to come so very heavily disguised as chaos. Joyce Grenfell
You may often feel that heavily on your back which you took lightly on your conscience. Danish Proverb
He assumes a cheerful countenance suppressing the grief which weighs heavily on his heart. Latin Proverb
He that climbs high, falls heavily. German Proverb