The phrase "a very serious challenge" is correct and usable in written English.
You can use it when discussing a difficult situation or problem that requires significant attention or effort to overcome.
Example: "The team faced a very serious challenge when the project deadline was moved up by two weeks."
Alternatives: "a significant challenge" or "a major obstacle."
Despite Lekuton's successes, he faces a very serious challenge from Godana Harugura.
"I want to tell you guys that this is a very serious challenge, and an adequate response is necessary," he said.
"At a time when demand is a very serious challenge for us this summer," Mr. Abraham said, "anything that puts disincentives in place, that would work against reducing demand, I think has to be looked at very closely".
Based on unofficial results, officials with one of the two governing parties conceded that they faced a very serious challenge from the upstart Gorran coalition in Sulaimaniya, one of the biggest cities in Kurdistan.
One told the BBC: "This is a very serious challenge to the way the society operates...
In fact, land degradation is a very serious challenge as it leads to hunger, poverty and is at the root of many conflicts (FAO 2017).
The official, who has close knowledge of the so-called six-party talks aimed at dismantling the North Korean nuclear programs, suggested that the recent revelation of a new uranium enrichment facility in the North was "a very, very serious challenge and a real provocation".
"This is a very, very serious challenge to the defense," said John Holdridge, a former death penalty lawyer in Connecticut who is the director of the American Civil Liberties Union's Capital Punishment Project.
However, Cameron is facing the very serious challenge of how to unite the UK after such a comprehensive victory by the Scottish National party in Scotland, where it won all but three seats.
Now one very serious challenge to the tenseless theorist is to explain why, if time does not pass in reality, it appears to do so.
"This administration knows that they've got a couple of very serious challenges in front of them, but they're not quaking," Ms. Northup said.
