fool's errand
A task that has little to no chance of being successful or beneficial. Giving the baby a bath before he eats spaghetti is a fool's errand.
fool's errand
A fruitless mission or undertaking, as in Asking the bank for yet another loan was clearly a fool's errand. [c. 1700]
a ˌfool’s ˈerrand
a journey, task, etc. that is a waste of time because it was not necessary: Are you sending me on a fool’s errand again? The last time you sent me to get tickets, the play wasn’t even on.An errand is a job that you do for somebody that involves going somewhere to take a message, to buy something, etc.