gid·di·ness \ˈgidēnə̇s, -din-\noun (-es) Etymology: Middle English gidinesse, gedinesse, from gidy, gedy + -nesse -ness : the quality or state of being giddy < all the gaiety and spirits, but … little of the giddiness of youth — Earl of Chesterfield > < a dimness and giddiness crept over him — Charles Dickens >