moot point

The etymology of the word koldun is still, I believe, a moot point.

The actual temperature of the moon's surface by day is a moot point.

Whether Ferdinand was justified in doing this was long a moot point.

Whether he was the son of a vintner or a joiner is a moot point.

How far Gumming believed his own prophecies is a moot point.

It is a moot point still with some, whether he was not put there by man.

The length at which these canes shall be left is a moot point.

It was a moot point as to whether they'd be dried out or steamed alive first.

Whether, in accordance with the common practice of the Eastern Church at that time, Dionysius was married or not, is a moot point.

Whether they really interested children as they delighted their elders is a moot point.