means Intense, vengeful anger — fury so deep it tips over into the desire to punish or destroy.

from From Old English 'wrǣththu,' meaning anger or fierceness, built on the adjective 'wrāth' (angry, twisted), which is the same word as the modern 'wroth.' That root carries a sense of being twisted or wrung out of shape — a cousin of 'writhe' and 'wreath,' all sharing the old Germanic idea of bending and twisting. So wrath is, quite literally, anger that contorts you.