Ipse dixit
Assertion without proof / From Wikipedia, the free encyclopedia
Ipse dixit (Latin for "he said it himself") is an assertion without proof, or a dogmatic expression of opinion.[1][2]
The fallacy of defending a proposition by baldly asserting that it is "just how it is" distorts the argument by opting out of it entirely: the claimant declares an issue to be intrinsic and immutable.[3]