futile

adjectives

producing no result or effect
"a futile effort"; "the therapy was ineffectual"; "an otiose undertaking"; "an unavailing attempt"
futile, ineffectual, otiose, unavailing
is derived from
futility
unproductive of success
"a fruitless search"; "futile years after her artistic peak"; "a sleeveless errand"; "a vain attempt"
bootless, fruitless, futile, sleeveless, vain