Nassim Taleb, the originator of the term, said the following on antifragility:
Some things benefit from shocks; they thrive and grow when exposed to volatility, randomness, disorder, and stressors and love adventure, risk, and uncertainty. Yet, in spite of the ubiquity of the phenomenon, there is no word for the exact opposite of fragile. Let us call it antifragile. Antifragility is beyond resilience or robustness. The resilient resists shocks and stays the same; the antifragile gets better.
We know fragile things.
They break easily with a little stress and disorder.
Antifragile things don’t just resist a shock, damage, or crisis but also thrive under these conditions.