His most recent column sent me running to dictionary.com: "State governments, too, are expected to accept Washington’s whims, but plucky Indiana is being obdurate." Will used this word a few months ago and I think Ben Hur used it. In both cases I merely pretended to get it but now I have to know...
1. unmoved by persuasion, pity, or tender feelings; stubborn; unyielding.
2. stubbornly resistant to moral influence; persistently impenitent: an obdurate sinner.
Now I can use it in a sentence: "Blue jeans are widely considered to be harmless, but Mr. Will is obdurate on the matter."