Uncertain
Part of speech: adjective
Definition: not known for certain; questionable not yet determined; undecided variable and subject to change fitful or unsteady unpredictable or capricious
Example sentence: The very essence of leadership is that you have to have vision. You can't blow an uncertain trumpet.
Dubious
Part of speech: adjective
Definition: Arousing doubt; questionable; open to suspicion.In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided.
Example sentence: You've had an extremely weak euro on the foreign exchange markets, you've had a very dubious policy being followed.