'Severe' in the Bible

Listen carefully, I will throw her on a bed of sickness, and those who commit adultery with her [I will bring] into great anguish, unless they repent of her deeds.

Then the fifth angel poured out his bowl on the throne of the beast, and his kingdom was plunged into darkness; and people gnawed their tongues because of the pain [of their excruciating anguish and severe torment],

And there were flashes of lightning and loud rumblings and peals of thunder; and there was a massive earthquake—nothing like it has ever occurred since mankind originated on the earth, so severe and far-reaching was that earthquake.