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doubtful 
1  adj If it is doubtful that something will happen, it seems unlikely to happen or you are uncertain whether it will happen. 
For a time it seemed doubtful that he would move at all...  
2  adj If you are doubtful about something, you feel unsure or uncertain about it.  (=dubious) 
I was still very doubtful about the chances for success...  
 doubtfully  adv  (=dubiously) 
Keeton shook his head doubtfully.  
3  adj If you say that something is  of  doubtful quality or value, you mean that it is of low quality or value., (disapproval)   (=dubious) 
...selling something that is overpriced or of doubtful quality...  
4  adj If a sports player is doubtful for a match or event, he or she seems unlikely to play, usually because of injury.  (JOURNALISM)