The phrase "which has undermined" is grammatically correct and can be used in written English.
You can use this phrase when referring to something that has caused a decrease in confidence or trust, or to describe an event or event that has caused harm or destruction. For example: The recent rise in unemployment, which has undermined consumer confidence, has caused a decrease in sales.
That leaves the defense, which has undermined the Saints the last few seasons.
But Bovis Homes has disappointed with its figures, down 84.5p at 904.5p which has undermined the rest of the sector.
New Labour has over-centralised power at the top, which has undermined democratic accountability at all levels.
His job in this (and not only this) case, which has undermined Russia's international prestige, is to find ways of justifying something that cannot be justified.
Others worry that Kazakhstan will be used by Russia, which has undermined the O.S.C.E. in the past, to advance Russian initiatives.
"I take responsibility for this accident, which has undermined trust in nuclear safety and brought much grief and fear to society," Mr. Shimizu said.
The putting woe which had undermined his attempt to run away with this competition, never mind win it, returned.
It has everything to do with year after year of steadily rising labour costs and falling productivity, which have undermined Italian competitiveness and exports.
The business secretary said the concerns about corporate behaviour related to "a very small number of businesses, which have undermined the reputation of British business generally".
Loughton argued that a disproportionate time was taken up by Brittan and Bramall's cases due to their high-profile status, which had undermined confidence in the force.
In the last decade the church has been accused of failing to fully address a series of child abuse scandals which have undermined its status as a moral arbiter, though it has paid many millions in compensation settlements worldwide.
