'Heavy' in the Bible

Then Moses said to the Lord, “Please, Lord, I am not a man of words (eloquent, fluent), neither before nor since You have spoken to Your servant; for I am slow of speech and tongue.”

Then the Lord did so. And there came heavy and oppressive swarms of [bloodsucking] insects into the house of Pharaoh and his servants’ houses; in all the land of Egypt the land was corrupted and ruined because of the [great invasion of] insects.

hear this: tomorrow about this time I will send a very heavy and dreadful hail, such as has not been seen in Egypt from the day it was founded until now.

But Moses’ hands were heavy and he grew tired. So they took a stone and put it under him, and he sat on it. Then Aaron and Hur held up his hands, one on one side and one on the other side; so it was that his hands were steady until the sun set.

You will certainly wear out both yourself and these people who are with you, because the task is too heavy for you [to bear]; you cannot do it alone.