Debatable – not agreed upon, no one knows
What is know is that its occurrence was first recorded in roughly 1500 BC in areas of India, but the exact date of its inception is debatable.
No one can agree on what the US should do in Iraq. It's a debatable topic.
It's debatable whether it will rain tomorrow or not.
I do not think they will win the game, but it's debatable.
I did so bad at school this year, it's debatable whether I will be let back in.
If I don't feel better tomorrow, it's debatable whether I will come to the party.