The Collaborative International Dictionary of English v.0.48:
Inelastic \In`e*las"tic\, a. 1. Not elastic. [1913 Webster] 2. (Economics) reacting little to changing price; -- of demand; as, Potatoes have an inelastic demand. [PJC]WordNet (r) 3.0 (2006):
inelastic adj 1: not elastic; "economists speak of an inelastic price structure" [ant: elastic]