noun: the trait of being rude and impertinent
The speeding car had the gall to switch five lanes at once, run through a red light, and then cut off a police car before finally coming to a stop in front of a sea of flashing red lights.
noun: feeling of deep and bitter anger and ill-will
In an act of gall, Leah sent compromising photos of her ex-boyfriend to all his co-workers and professional contacts.
verb: to strongly bother, vex, annoy, exasperate
I try to look for the best in Gwendolyn, but her bad attitude really galls me.