disputable

If I believe the sun revolves around the Earth, is that now a disputable fact?

You know how dangerous any controversy on a disputable point would be with a man of his talents.

Many people think particular points disputable; but this you certainly expected.

Even in the education of the young this is now held to be a disputable theory.

Just who are the "salt of the earth" is a disputable question.

His claim of blood was an uncertain and disputable one even by men of his own party.