Definition from macmillandictionary.com
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an area that relied heavily on the mines for jobs
heavily populated urban areas
Her work was heavily influenced by her father’s.
Both of us are heavily involved in charity work.
heavily polluted rivers
The economy is heavily dependent on coal exports.
They had borrowed heavily to buy the boat.
She had been smoking heavily since her teens.
I was bleeding heavily from the cut.
He slipped and fell heavily.
She leaned heavily on the table.
He was fast asleep in the chair, snoring heavily.
I was very unfit, so I was puffing heavily by now.
He walked heavily away.
‘It’s too late,’ she said heavily.
The prospect of breaking her promise lay heavily on her mind.