Gauche (gōsh), n. [F.] 1. Left handed; hence, awkward; clumsy.[1913 Webster]
2. (Geom.) Winding; twisted; warped; -- applied to curves and surfaces.[1913 Webster]
3. Lacking grace and perceptivity in social situations; crude; tactless; socially inept.Syn. -- graceless; unsophisticated.[PJC]
4. (Chem.) Not planar; -- of molecules or molecular conformations.[PJC]