The phrase "a formidable example" is correct and usable in written English.
It can be used to describe something that serves as a strong or impressive instance of a particular quality or characteristic.
Example: "Her dedication to volunteer work is a formidable example of community service that inspires others."
Alternatives: "an impressive instance" or "a striking example".
One commentator called it a "formidable example of Christian Democrat oratory".
"Pippa stands out as a formidable example for younger and older generations alike," Contini said.
The dove still figures importantly in the Left Wing symbolism, but the variety in evidence is a formidable example of what breeding can do, being capable of flying, scarcely without pause across the mountains of Tibet down into the Valleys of Pyonang, and all the way to Lake Success... View Article By Rivka Galchen By Larissa MacFarquhar By Jia Tolentino By Ceridwen Dovey.
The dove still figures importantly in the Left Wing symbolism, but the variety in evidence is a formidable example of what breeding can do, being capable of flying, scarcely without pause across the mountains of Tibet down into the Valleys of Pyonang, and all the way to Lake Success... View Article By David Remnick By Jelani Cobb By Sam Knight By Ian Parker.
The Bioclipse-QSAR is a formidable example of this; Descriptors can be calculated on the local computer while, if connected to a network, remote services can provide additional descriptors or offer high performance computers for speeding up demanding calculations.
She sets a formidable example with her own work habits: Desprez, who did research with Campisi from 1991 to 1996, recalls that she was often in her office till midnight or 2 a.m., never took a day of vacation, and one year even held a lab group meeting on Christmas Day.
For the last two examples, developing an analytical model is a formidable task at best.
The Porsche Cayenne sport-utility vehicle, for example, is not only a formidable performance machine, but also a runaway success.
Confining your examples to a single family is a formidable restriction.
"He's a formidable candidate".
That was a formidable problem.
