The top Google result when searching for how to uninstall an Active Directory LDS (Formerly known as ADAM) instance doesn’t seem to apply to 2012 anymore. It was more straightforward in 2008 R2 and before as each instance just showed up as a Windows Feature.
Googling the problem didn’t yield the simple solution, but it truly is simple. Before you waste a bunch of time right-clicking random crap in Server Manager and going through the add/remove features seven ways from Sunday, hopefully you found my howto here. It’s as simple as this:
Click through a few dialogue and warning boxes and you’re done.