'Mightily' in the Bible

The Spirit of the Lord came upon him mightily, and he tore the lion apart as one tears apart a young goat, and he had nothing at all in his hand; but he did not tell his father or mother what he had done.

When he came to Lehi, the Philistines came shouting to meet him. And the Spirit of the Lord came upon him mightily, and the ropes on his arms were like flax (linen) that had been burned, and his bonds dropped off his hands.

And Samson said, “Let me die with the Philistines!” And he stretched out with all his might [collapsing the support pillars], and the house fell on the lords and on all the people who were in it. So the dead whom he killed at his death were more than those whom he had killed during his life.