debateable

It was of course its position in the Debateable Land which prompted its builders to invest it with such strength and solidity.

I well know, that in merely touching upon it, I tread upon delicate and debateable ground.

Nor is it merely in some indifferent and debateable views that it has left its proper sphere.

Optical complications fatally impeded sharpness of vision, and the phenomena took place in a debateable borderland of uncertainty.

He scrutinizes with care every inch of debateable ground which lies in his path.