I'm a literal person and I take words from the dictionary. "The state of being seriously mentally ill; madness" "Extreme foolishness or irrationality."
:3 There's how I view insanity. The mentally ill part everyone must agree on because if you are bipolar.. you are insane (Medicine Helps). And if you'd rather save a chair that you got yesterday than another human's life that also is insane. I don't think this word is very flexible although rationality is a bit. I like how you thought about it though, your much more creative than me.