The phrase "indefensible for" is correct and can be used in written English.
It is commonly used to describe something that is not justifiable or cannot be defended. Example: The company's decision to lay off hundreds of employees without proper notice is indefensible.
The £5.1bn Premier League TV deal makes it indefensible for all clubs not to offer the same.
It is also indefensible for the leaders of organizations to sell out their own on the basis of an accusation.
It is indefensible for the character of the country's most valued institution to be changed in this way without the public being given a say".
It is indefensible for a country as rich as the United States to fail to provide adequate health care for many of its citizens.
He now accepts that, once Scottish affairs have been devolved to a parliament in Edinburgh, it will be indefensible for Scotland to continue to have more MPs in London than its population warrants.
By joining together to oppose Lords reform, they preserved the indefensible for three decades.Comparing the 1970s and 1980s with today, there were more MPs on the make, more part-timers, more time-servers and, noticeably, far more drunks.
The untenable and indefensible situation for those in the private sector cannot last.
It argues convincingly that there's real revenue to be netted by cracking down on indefensible boons for the top tax brackets.
I was determined that the individual books should stand alone – it's indefensible, aesthetically, for it be just one huge book chopped into three.
That now seems probable, despite Mr Brown's initial, indefensible preference for a closed version: with Mr Bush departed and Saddam dead, the case for privacy was always piffling.
It convincingly argues that there's real revenue to be netted to help wrestle down the deficit if Congress dared to crack down on indefensible boons for the top brackets.
