'Heavily' in the Bible

"Come to me, all you who labor and are heavily burdened, and I will give you rest.

for made gross was the heart of this people, and with the ears they heard heavily, and their eyes they did close, lest they might see with the eyes, and with the ears might hear, and with the heart understand, and turn back, and I might heal them.

So the latter held a conference with the Elders, and after consultation with them they heavily bribed the soldiers,