undemonstrated

By dint of hard work and undemonstrated brilliance, Redl rises to high military and social rank and becomes deputy chief of the army's espionage service.

From Time Magazine Archive

It is entirely undemonstrated; it may never be proved.

From "Cosmos" by Carl Sagan

Had there been something latent in the man, a terrible undemonstrated genius agitating and embarrassing his demeanor, we had watched for its advent.

From Essays — Second Series by Ralph Waldo Emerson

Hence, the only proper point of view to take is that from which we set aside as too bold, all daring and undemonstrated assertions on these matters.

From Criminal Psychology; a manual for judges, practitioners, and students by Hans Gustav Adolf Gross

For one is an ascent from sensibles to the first intelligibles; a second is an ascent through things demonstrated and subdemonstrated, to undemonstrated and immediate propositions; and a third proceeds from hypothesis to unhypothetical principles.

From Introduction to the Philosophy and Writings of Plato by Thomas Taylor