The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.
A liquid whose viscosity is less than that of water is sometimes known as a mobile liquid, while a substance with a viscosity substantially greater than water is called a viscous liquid.* This visualization will help us to figure out which liquids are in each of the aforementioned categories.
*<https://en.wikipedia.org/wiki/Viscosity> 10/2/2014