tone down = less piissed off ?

Most of you know Karma already, so I wont go over her. Ludwig however, has changed a little bit. He has lost a little weight and is more toned down...that is to say, less piissed off. His dress changes, depending on where he is. If he's in the lab, he'll still have that wild, poofy blue hair with a lab coat on while in special ceremonies he'll make his hair into a ponytail and wear a fancy suit. He dislikes most of his siblings, save for Roy (probably because Roy is stronger than him) and Larry, to an extent. He especially hates Lemmy and the two often get into loud confrontations.



What's toned down mean and why less pissed off(mad?)?