Kieran stated his conditions clearly, and they were absolutely non-negotiable.

Moisturize, Moisturize and Moisturize Some More This is absolutely non-negotiable!

For me it's absolutely non-negotiable.

Providing love and sustenance for one's family is absolutely non-negotiable for Greeks, whose sense of honour (filotimía) is inalienably connected with self-respect and self-sufficiency.