Thread:LucidPigeons/@comment-27729149-20150425083602/@comment-27560932-20150512214053

The "chaotic" alignment is a character who does not follow any moral code (like Lawful) and are behest to only what they feel is right. Chaotic doesn't necessarily mean crazy and psychotic, it means their methods and code follow a self-righteous chaos. Some Chaotic Evil's can be hard to tell apart from Neutral Evil's for this reason. Chaotic Evil is when said character is evil, when Chaotic Neutral still has the same traits as a Chaotic Evil, but is comparatively less morally reprehensible.

See this and this for a more in-depth look if you're still confused.