The phrase "an already formidable" is correct and usable in written English.
It can be used to describe something that is already impressive or powerful before any additional factors are considered.
Example: "The team faced an already formidable opponent in the championship game, making their victory even more remarkable."
Alternatives: "a pre-existing formidable" or "an already impressive".
Rice will join an already formidable receiving corps of Tim Brown, Andre Rison and James Jett.
Evening specials added 5 more appetizers, 4 main courses and a dessert to an already formidable line-up.
McEwan's novel, regarded by a number of critics as the masterpiece of an already formidable career, was second favourite at 15-8.
Dillon's importance to an already formidable Patriots lineup has grown with injuries to two receivers, Troy Brown and Deion Branch, who may not play Sunday.
Paddy Considine - best known for his roles in Tyrannosaur, Hot Fuzz and Dead Man's Shoes - will be joining an already formidable cast including Cillian Murphy, Sam Neil and Tom Hardy.
The real aim, they say, besides enforcing moral standards on the likes of Mr. Oktar, is to close off a final refuge for the news media and the political opposition as the government widens an already formidable crackdown on dissent.
Rahul Dravid, one of India's truly great Test batsmen, will bolster an already formidable-looking MCC top order.
The recipient, of course, is Sir Frederick Ashton, C.H., C.B.E., who can now add an O.M. to the already formidable alpha bet of initials clinging grandly to his name.
"The deliberate creation of a stateless underclass increases the already formidable risks of exploitation," said a recent report by the American Federation of Labour and Congress of Industrial Organisations.
In ordinary times, the poor, downtrodden, oppressed people would have no chance against the evil empire, no recourse to counter the import of a foreign addition to the already formidable force the enemy had amassed.
The executive has failed to prove that extraterritorial search warrants seeking stored electronic information would be more than a trivial addition to its already formidable law enforcement arsenal, i.e., it has not shown that even one non-trivial crime has escaped detection or prosecution because of the absence of extraterritorial search warrants.
