early 15c., from Medieval Latin obstinantia, from obstinantem, from obstinatus "resolved, determined, resolute" (see obstinate).
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for obstinance
Bruce Bartlett wonders if the obstinance of the GOP's conservative wing will lead to a new era of bipartisanship.Here's Something Debt Ceiling Obstinance May Create: A New Bipartisan Era
January 14, 2013