indeterminate

adjective

• not exactly known, established, or defined:the date of manufacture is indeterminate
• (of a judicial sentence) such that the convicted person’s conduct determines the date of release.
• Mathematics (of a quantity) having no definite or definable value.
• Medicine (of a condition) from which a diagnosis of the underlying cause cannot be made:indeterminate colitis
• Botany (of a plant shoot) not having all the axes terminating in a flower bud and so producing a shoot of indefinite length.