un·hinged \|ən|hinjd\adjective Etymology: in sense 1, from past participle of unhinge; in sense 2, from un- (I) + hinged, past participle of hinge 1. a.: no longer joined by or as if by a hinge b.: deranged, disorganized < a belief … that the United Nations could keep the world from becoming unhinged in another war — Norman Cousins > 2.of a stamp: never mounted or hinged