debatable

Open to debate; not fully proved or confirmed.

• Those data are debatable: no one has been able to replicate them.
• It's debatable whether he is the best candidate for the position.

Able to be debated; up for discussion.

• The lack of bonuses this year is not debatable.

A topic that is open to debate.

• Just how many glaucoma patients there are in the United States and just how prevalent is the disease are two unknowns or at least two debatables.