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Jul 11, 2016 · Unhinged is from the Old English "hęncg", a derivative of 'hang'. " Unhinged " is recorded in its sense of a disordered mind before its sense of taking a door (or similar) off its hinges. Unhinged is used only to describe mental conditions. (The converse "hinged" is not used to describe sanity.) Other than that, there are no great differences.