The phrase "a source of serious" is correct and usable in written English.
It can be used when discussing something that causes significant concern or issues.
Example: "The recent data breach is a source of serious worry for our customers."
Alternatives: "a cause of major" or "a source of significant".
First, the counterterrorism effort that now provides the foundation for strategic cooperation could become a source of serious friction.
"I guess when we're talking about how good friends treat one another, that's a source of serious concern as well".
"The view from the French is that Venezuela 'es en flames' and a source of serious concern for Cuba".
In the late 19th century, Victorian-era doctors described the male foreskin as a "source of serious mischief".
Local officials freely admit that the dump is a source of serious pollution.Deonar is by no means unusual.
The performance of most African governments in implementing the reforms necessary to turn their economies around has also been a source of serious concern.
That mat beneath you can be a source of some serious off-gassing.
Cytomegalovirus (CMV) is a common opportunistic infection among HIV-infected individuals, a major source of serious complications among organ-transplant recipients, and a leading cause of hearing loss, vision loss, and mental retardation among congenitally infected children.
Cytomegalovirus (CMV) is a common opportunistic infection among human immunodeficiency virus (HIV -infected individuals, a major source of serious viral complications among organ-transplant recipients, and a leading cause of HIV -infected vindividuals and majorl retardation among congenitally infected children.
"Africa has always been used as a reference point," Mr. Olowu said, "but not as a valued source of serious fashion".
