1. Acting as if having an unsoundness of mind, persistent mental disorder or derangement.
a. Choosing to act mentally deranged; crazy
b. (as collective noun; preceded by the) the unsane
3. Characteristic of a person acting as if they are of unsound mind; an insane stare
4. irresponsible; very foolish; stupid behavior
I'm unsane. I have a full grasp of sanity, I just choose to ignore it for my own amusement.