The phrase "scandalous waste" refers to an extravagant or unnecessary squandering of resources that is deemed highly shocking, inappropriate, or offensive. Full definition
What an absolutely scandalous waste of public money for publicly funded bodies to be suing each other. (schoolsweek.co.uk)
Asked about the EU referendum bill at a post-summit press conference, the Prime Minister said he had to convince other leaders the booklet was not a hoax but «a genuine, scandalous waste of money». (bbc.com)
PCS also highlighted the scandalous waste of billions of pounds in the MoD equipment programme and the employment of thousands of non-deployable service personnel. (politics.co.uk)