DuskStar is pretty close.

Anti-fragile describes systems that improve from disorder. Robust describes ones that resist disorder.

The ceramic plate is robust: it’s very strong, and unlikely to break when things go wrong (e.g. it gets dropped). But it’s not anti-fragile, it will never be made better by dropping, at best it won’t get worse.

The petrol market in Puerto Rico is anti-fragile because the disorder of small power failures made it better, they added backup power so that the system would be more robust next time the power went out.

Because they mean different things. A robust system is one that can tolerate stress without suffering much harm. An antifragile system is one that actually benefits from stress.

IMO it's the difference between a really strong piece of ceramic that happens to not break when you whack it with a hammer, and something like safety glass that shatters yet stays intact. The ceramic is robust, but with a big enough whack it'll shatter into a million pieces - but the fragility of the safety glass is known and prepared for to the point where it breaking doesn't lead to a complete failure.

I discovered that this is the titular concept behind a popular self-help/philosophy book.

Sounds smarter.