The phrase "all undermined" is correct and usable in written English.
It can be used to describe a situation where everything has been weakened or compromised.
Example: "The team's morale was all undermined after the negative feedback from management."
Alternatives: "completely weakened" or "entirely compromised".
That is all undermined when key ministers are at war with each other.
Work, family life, health and education are all undermined by crowded houses".
Yet they're all undermined by a production, new in 2007, that's decoratively tacky, stylistically inconsistent and textually muddled.
Art and commerce, the beau monde and the demimonde, city and country are all undermined by the trickery of both good and evil.
Privatisation, deregulation, labour reforms and the growth of temporary employment and outsourcing have all undermined the position of employees, particularly in unskilled jobs.
Widespread corruption, the massive arming of militias, the fuelling of war by neighbouring countries, the civilian losses and night raids and deterioration of security have all undermined our children's education, out women's ability to work, our ability to provide basic social services to the neediest part of population.
Palestinian violence, Palestinian anti-Semitic incitement and jihadist infiltration of the Palestinian national movement all undermine peace efforts.
The way last year blew off course in September might make skeptics of us all, undermining confidence in even the soberest expectations, the likeliest of possibilities.
Social and ecological factors such as climate change, energy and food insecurity, counterfeit drugs, antimicrobial and insecticide resistance and poverty all undermine health in our interconnected world.
Layard points a finger at predictable culprits: Changes in gender roles and divorce rates, television, geographical mobility, debased moral values, and the rise of individualism all undermine happiness, according to his book.
Eventually, Turkey's behavior raised questions about its willingness to curb the terrorist group at all, undermining its credibility in NATO as well as in Washington.
