The word "indefensible" means that something cannot be justified or explained in a reasonable way because it is very wrong or unacceptable. Full definition
Accident prone Chris Grayling pushed out of the trench to defend indefensible tax credits & attack Lords on R4.So it's true, he must B4 chop (totalpolitics.com)
This large a change would bring out pitchforks and torches as people realize just how badly they've been used by a small group of scientists and politicians, how much they are the victims of indefensible abuse of statistics to average in the terrible with the merely poor as if they are all equally likely to be true with randomly distributed differences. (judithcurry.com)
Demonizing and condemning people for being themselves is analogous to (and just as indefensible as) racial bigotry and hatred. (religion.blogs.cnn.com)