Heavily
3 verses in 3 books of the King James Bible.
By Book
Every Occurrence
Exodus 14:25And took off their chariot wheels, that they drave them heavily: so that the Egyptians said, Let us flee from the face of Israel; for the LORD fighteth for them against the Egyptians.
Psalms 35:14I behaved myself as though he had been my friend or brother: I bowed down heavily, as one that mourneth for his mother.
Isaiah 47:6I was wroth with my people, I have polluted mine inheritance, and given them into thine hand: thou didst shew them no mercy; upon the ancient hast thou very heavily laid thy yoke.