Questionable
Questionable , adjective
1.
Admitting of being questioned; inviting, or seeming to invite, inquiry. [Rare]
Thou com'st in such a questionable shape
That I will speak to thee.
2.
Liable to question; subject to be doubted or called in question; problematical; doubtful; suspicious.
It is questionable whether Galen ever saw the dissection of a human body.T.