failing to succeed; unsuccessful

an abortive rebellion; an abortive scheme.

born prematurely.

imperfectly developed; rudimentary.

Medicine/Medical .

producing or intended to produce abortion; abortifacient.

acting to halt progress of a disease.

Pathology . (of the course of a disease) short and mild without the usual, pronounced clinical symptoms.

Botany . (of seeds or pollen grains) imperfect; unable to germinate.

adjective

complete , consummated , effectual , efficient , fruitful , productive , successful

adjective

failed , failing , fruitless , futile , ineffective , ineffectual , miscarried , unavailing , unproductive , unsuccessful , useless , vain , worthless , frustrate , imperfect , miscarrying , rudimentary , sterile , undeveloped