impossible à trancherSurtout dans un contexte général, lorsque rien ne permet de conclure.
Definitionen
Not able to be resolved or determined; not capable of being decided.
The question of whether the universe is infinite or finite remains undecidable with current scientific knowledge.
In mathematical logic and computer science, of a decision problem: impossible to solve by any algorithm that always terminates with a correct yes-or-no answer.
The halting problem is undecidable for Turing machines.