How could one describe a situation in which no trick, no approach, no magic, nothing at all works to change the outcome? One where you have no choice but to accept things as they are.
For example, I can't use the excuse that I was ill for missed homework because I've already used it. Or when this happens with your boss?
What can I call such situation, in a single word, wherein you just have to accept the blame, just have to give in to the situation you are in?