Mohamed El-Erian warned of slower global growth, stubborn inflation, and higher unemployment.
The top economist pointed to signs of weaker demand and the likelihood of further Fed rate hikes.
"Stagflation" describes a toxic combination of stagnant economic growth, elevated inflation, and rising joblessness.
In El-Erian's view, the Fed's aggressive interest-rate hikes risk choking growth and driving up unemployment, while failing to temper price increases.
Earlier in September, El-Erian warned that global growth has become more fragile thanks to Europe's energy crisis, China's continued lockdowns, and the US's high inflation and waning demand.