While "insanity" is already an abstract noun, it represents the state or condition of being insane.
Here's a breakdown:
* Insanity (abstract noun): The mental state characterized by irrationality, delusion, or extreme emotional instability.
* Insane (adjective): Describes someone who is mentally unstable or irrational.
Let me know if you have any other words you'd like to find the abstract noun for!