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.
Not sure as to aim or effect desired.
Unreliable; insecure; not to be depended on.
Not firm or fixed; vague; indeterminate in nature; fluctuating.
Undecided; hesitating; not resolved.
Not steady; fitful.
Liable to change; fickle; inconstant; capricious; irresolute.