I think that's "fail" in a way that's different from "blunder". Let's say I'm a programmer. I try an approach. It doesn't work. I realize it doesn't work an

I think that's "fail" in a way that's different from "blunder". Let's say I'm a programmer. I try an approach. It doesn't work. I realize it doesn't work and back out my changes. That's a failure. Let's say instead I try an approach. It' doesn't work. I keep trying to force it to work, distorting the overall architecture and still leaving an unreliable, unmaintainable mess. That's a blunder.