'Heavy' in the Bible

And Moses' hands were heavy; then they took a stone, and put it under him, and he sat on it; and Aaron and Hur supported his hands, one on this side, and one on that side; and his hands were steady until the going down of the sun.

Thou wilt be quite exhausted, both thou and this people that is with thee; for the thing is too heavy for thee: thou canst not perform it alone.

And it came to pass on the third day, when it was morning, that there were thunders and lightnings and a heavy cloud on the mountain, and the sound of the trumpet exceeding loud; and the whole people that was in the camp trembled.