- The condition of being insane, a derangement of the mind
- Law Such unsoundness of mind as affects legal responsibility or capacity
- Psychiatry (formerly) Psychosis
- Extreme folly; senselessness; foolhardiness
I’ve heard it a eleventy billion times: “Isn’t that the definition of insanity? Doing the same thing over and over and expecting a different result?”
Just so we’re clear, No. Not the definition of insanity. If I want to do the same thing over and over and expect a different result, that might mean I’m persistent, or insistent, or hopeful, or maybe even dumb. But I’m not insane.