Verses with the word marvellously in the Old Testament (2 verses):

2 Chronicles 26:15
And he made in Jerusalem engines, invented by cunning men, to be on the towers and upon the bulwarks, to shoot arrows and great stones withal. And his name spread far abroad; for he was marvellously helped, till he was strong.

Job 37:5
God thundereth marvellously with his voice; great things doeth he, which we cannot comprehend.