uncertain

Not known or established; questionable.

Not determined; undecided.

Not having sure knowledge.

Subject to change; variable.

Unsteady; fitful.

To make or cause to be uncertain.

Not certain; doubtful.

Not known as regards quantity or extent; indefinite; problematical: as, an uncertain number of independent voters; a person of uncertain age.

Having doubts; without certain knowledge; not sure.