Not certain; unsure.
Not yet determined; undecided.
Variable and subject to change.
Fitful or unsteady.
Unpredictable or capricious.
Not known for certain; questionable.
Something uncertain.
Presumptuous, above oneself, self-important; arrogant, snobbish, haughty.
Exceeding one's station or position, assuming prerogatives to which one is not entitled.