The story
From thunder + struck. Compare synonymous and cognate Latin attonitus. Also compare typologically Ancient Greek ἐμβρόντητος (embróntētos) (< βροντή (brontḗ)) (whence Greek εμβρόντητος (emvróntitos)); Czech ohromený (< ohromit), Bulgarian като ударен от гръм (kato udaren ot grăm), Russian как гро́мом поражённый (kak grómom poražónnyj) (akin to гром (grom)). See also German wie vom Donner gerührt.
Etymology from Wiktionary, CC BY-SA 4.0.