Futile

useless fruitless vain ineffective unsuccessful empty idle abortive profitless sterile hollow impractical in vain worthless trivial unavailing insufficient unproductive valueless barren forlorn nugatory otiose bootless delusive exhausted impracticable ineffectual resultless unimportant unneeded unreal unsatisfactory unsubstantial to no avail to no purpose on a treadmill out the window no dice save one’s breath to no effect trifling