Englishunavailing
adjective
persistent calls for justice were unavailing:
ineffective, ineffectual, inefficacious, vain, in vain, futile, useless, unsuccessful, non-successful, nugatory, failed, fruitless, unproductive, profitless, unprofitable, pointless, to no avail, to no purpose, to no effect, abortive, inadequate;
archaic for nought, bootless;
rare Sisyphean.
▷antonyms effective, successful.
unavailing Oxford Dictionary of English