The phrase "a formidable public" is correct and usable in written English.
It can be used to describe a large, influential, or impressive audience or group of people, often in contexts related to events, speeches, or public opinion.
Example: "The politician addressed a formidable public, eager to hear his plans for the future."
Alternatives: "an impressive audience" or "a powerful crowd".
Even his detractors admit that Modi is a formidable public speaker.
At Harvard Law School, from which he graduated in 1995, he was also known as a formidable public speaker.
Hers is the CV of a formidable public economist.Mr Ocampo was also finance minister, though his time in office, 1996-98, saw the budget deficit balloon.
With the church as his power base, Powell was able to build a formidable public following in Harlem through his crusades for jobs and housing for the poor.
Like many big tech companies, Apple has a formidable public relations staff, but Mr. Jobs was not constrained by this either.
But if you judge a man by his enemies, the chairman of the BBC Trust and all-purpose Big Cheese is still a formidable public figure.
But the Revolution Square protests do suggest that any emerging coalition between Iran's progressive elite, led by students and intellectuals, and ordinary discontented people could pose a formidable threat.In public, the supreme clerical leader, Ayatollah Ali Khamenei, blamed America and other western powers for fomenting the latest unrest in a bid to bring down the Islamic Republic.
De Beers, with its formidable public relations and corporate resources, went into top gear, reinventing itself as a crusader for clean diamonds.
The first draft of the Bill was draconian, but, in the face of formidable public and media opposition, it was delayed for two years.
If that were allowed to happen, or Greece were permitted to split from the 16-member single currency zone, speculators' attention would soon turn to much larger states with formidable public deficits, including Spain, Portugal and Ireland, potentially blowing the euro project apart.
George is perhaps the most formidable public intellectual on the religious right.
