From Old English 'gemǣd' (rendered insane), from Proto-Germanic *ga-maidijaną (to change, damage) — madness was originally a damaged mind.
Mentally ill; very angry; extremely enthusiastic.
From Old English 'gemǣd(ed)' meaning 'rendered insane,' past participle of *gemǣdan (to make insane), from Proto-Germanic *ga-maidijaną (to change, cripple). Originally meant 'changed' or 'damaged' in mind. Key roots: *maidijaną (Proto-Germanic: "to change, cripple").