'Fierce' in the Bible

before the appointed time when the day passes as the chaff, before the fierce anger of Yahweh comes on you, before the day of Yahweh's anger comes on you.

"Therefore wait for me," says Yahweh, "until the day that I rise up to the prey, for my determination is to gather the nations, that I may assemble the kingdoms, to pour on them my indignation, even all my fierce anger, for all the earth will be devoured with the fire of my jealousy.