1.
If it is ~ that something will happen, it seems unlikely to happen or you are uncertain whether it will happen.
For a time it seemed ~ that he would move at all...
It is ~ whether Tweed, even with his fluent French, passed for one of the locals...
ADJ: usu v-link ADJ, oft it v-link ADJ that/wh
2.
If you are ~ about something, you feel unsure or uncertain about it.
I was still very ~ about the chances for success...
Why did he sound so ~?
= dubious
ADJ: usu v-link ADJ, oft ADJ about n
~ly
Keeton shook his head ~ly.
= dubiously
ADV: ADV after v
3.
If you say that something is of ~ quality or value, you mean that it is of low quality or value.
...selling something that is overpriced or of ~ quality...
= dubious
ADJ: usu ADJ n disapproval
4.
If a sports player is ~ for a match or event, he or she seems unlikely to play, usually because of injury. (JOURNALISM)
ADJ: oft ADJ for n