Dictionary.com/effrontery:

effrontery (ih-FRUN-tuh-ree) noun

Brazen boldness; presumptuousness.

[French effronterie, from effronté, shameless, from Old French esfronte, from Vulgar Latin *effronttus, alteration of Late Latin effrns, effront- : ex-, ex- + frns, front-, front, forehead.]

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

---

n : audacious (even arrogant) behavior that you have no right to; “he despised them for their presumptuousness” [syn: presumption, presumptuousness, assumption]

Source: WordNet ® 2.0, © 2003 Princeton University

What a fun word! Enjoy and have fun with this one! I can imagine the characters now, and the fun confrontations that could ensue.