producing no result;useless;pointless
"a futile effort"
"the therapy was ineffectual"
"an otiose undertaking"
"an unavailing attempt"
"a fruitless search"
"futile years after her artistic peak"
"a sleeveless errand"
"a vain attempt"
Our speculations are futile until we have all the facts.
出自: Conan Doyle
His whole life has been a futile striving after the impossible.
出自: A. Storr