'Serious' in the Bible

"If men fight and hit a pregnant woman and her child is born prematurely, but there is no serious injury, he will surely be punished in accordance with what the woman's husband demands of him, and he will pay what the court decides.

But if there is serious injury, then you will give a life for a life,

The next day Moses said to the people, "You have committed a very serious sin, but now I will go up to the Lord -- perhaps I can make atonement on behalf of your sin."

So Moses returned to the Lord and said, "Alas, this people has committed a very serious sin, and they have made for themselves gods of gold.