'Fierce' in the Bible

The conflict with the Philistines was fierce all of Saul’s days, so whenever Saul noticed any strong or brave man, he enlisted him.

So Jonathan arose from the table in fierce anger, and did eat no meat the second day of the month: for he was grieved for David, because his father had done him shame.

Because thou obeyedst not the voice of the LORD, nor executedst his fierce wrath upon Amalek, therefore hath the LORD done this thing unto thee this day.