'Severely' in the Bible

I tell you that I am about to cast her upon a bed of sickness, and I will severely afflict those who commit adultery with her, unless they repent of conduct such as hers.

The first went and poured out his bowl on the earth, and severely painful sores broke out on the people who had the mark of the beast and who worshiped his image.

People were [severely] burned by the great heat; and they reviled the name of God who has power over these plagues, but they did not repent [of their sin] and glorify Him.