'Unrelenting' in the Bible

It would still bring me comfort,and I would leap for joy in unrelenting painthat I have not denied the words of the Holy One.

Set me as a seal on your heart,as a seal on your arm.For love is as strong as death;ardent love is as unrelenting as Sheol.Love’s flames are fiery flames—the fiercest of all.

Who smote the peoples in anger with incessant blows and trod down the nations in wrath with unrelenting persecution -- "[until] he who smote is persecuted and no one hinders any more.

In that day [the Lord will deliver Israel from her enemies and also from the rebel powers of evil and darkness] His sharp and unrelenting, great, and strong sword will visit and punish Leviathan the swiftly fleeing serpent, Leviathan the twisting and winding serpent; and He will slay the monster that is in the sea.

"This is what the sovereign Lord says: 'The Philistines have exacted merciless revenge, showing intense scorn in their effort to destroy Judah with unrelenting hostility.

"'You have shown unrelenting hostility and poured the people of Israel onto the blades of a sword at the time of their calamity, at the time of their final punishment.