Englishabortive
adjective
the rebels who led the abortive coup were shot:
failed, unsuccessful, non-successful, vain, thwarted, futile, useless, worthless, ineffective, ineffectual, to no effect, inefficacious, fruitless, unproductive, unavailing, to no avail, sterile, nugatory;
archaic bootless.
▷antonyms successful, fruitful.
abortive Oxford Dictionary of English