inelastic Syllabification: (in·e·las·tic)Pronunciation: /ˈiniˈlastik/Definition of inelastic adjective 1(of a substance or material) not elastic. 2 Economics (of demand or supply) insensitive to changes in price or income. 3 Physics (of a collision) involving an overall loss of translational kinetic energy. Derivatives inelastically adverb inelasticity noun inelastic in other Oxford dictionaries Definition of inelastic in the British & World English dictionary