The word supercilious proceeding forth from Bill's mouth is defined as:

Supercilious: (Adj.) Having or showing arrogant superiority to and disdain of those one views as unworthy.

Find out what else Bill has been saying ...(don't be diffident!)

Source(s) used for the word "supercilious":

1. http://wordnetweb.princeton.edu/perl/webwn?s=supercilious