abortive
/əˈbɔrdɪv/
adjective
Failing to produce the intended result.
an abortive attempt to overthrow the government
failed,unsuccessful,non-successful,vain,thwarted,futile,useless,worthless,ineffective,ineffectual,to no effect,inefficacious,fruitless,unproductive,unavailing,to no avail,sterile,nugatory