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: That night at Carnegie Hall was a great experience. When the thing was first put up to me I was a little dubious, not knowing just what would be expected of us.
Unconvinced
Part of speech: adjective
Definition: not convinced or lacking conviction