fruit·less
ˈfro͞otləs/
adjective

1.
failing to achieve the desired results; unproductive or useless.
"his fruitless attempts to publish poetry"
synonyms: futile, vain, in vain, to no avail, to no effect, idle; pointless, useless, worthless, wasted, hollow; ineffectual, ineffective, inefficacious; unproductive, unrewarding, frustrating, profitless, unsuccessful, unavailing, barren, for naught; abortive; archaicbootless
"fruitless negotiations"
antonyms: productive