The phrase "acknowledged a difficult" is not correct in written English as it is incomplete and lacks a noun to follow "difficult." It can be used in a context where you want to express recognition of a challenging situation, but it needs to be completed for clarity.
Example: "She acknowledged a difficult situation that required immediate attention."
Alternatives: "recognized a challenging" or "admitted a tough".
In introducing a Web site to defend the president's proposals, White House officials were tacitly acknowledging a difficult reality: they are suddenly at risk of losing control of the public debate over a signature issue for Mr. Obama and are now playing defense in a way they have not since last year's campaign.
But in introducing the Web site, White House officials were tacitly acknowledging a difficult reality: they are suddenly at risk of losing control of the public debate over a signature issue for Mr. Obama and are now playing defense in a way they have not since last year's campaign.
Baha acknowledges a "difficult trading environment" in which the two classes "have given back some of our profits".
This requires banks to acknowledge a difficult truth: Their identity in the banking ecosystem and the lives of their customers has fundamentally shifted.
Anti-187 strategists acknowledge a difficult uphill battle, particularly because even though anti-Proposition 187 forces have apparently raised more than twice as much money as proponents, fund-raising efforts have so far fallen short of the kind of money needed for an all-out television blitz against the initiative.
Before returning to Washington, Mr. Obama acknowledged facing a difficult task to persuade Congress.
BAGHDAD — The United States began a fragile new era in its turbulent history with Iraq on Wednesday as American political and military leaders marked the official end of combat operations but acknowledged that a difficult milestone, the creation of a new coalition Iraqi government, was not yet in reach.
Up until then, nobody – especially not any medical professional – had acknowledged what a difficult thing being allergic to sunlight is.
He's going to have to acknowledge a few difficult truths.
