'Unknown' in the Bible

I spelled out my law for him in great detail, but they regard it as something totally unknown to them!

For as I went around and observed closely your objects of worship, I even found an altar with this inscription: 'To an unknown god.' Therefore what you worship without knowing it, this I proclaim to you.

as unknown, and yet well-known; as dying and yet -- see! -- we continue to live; as those who are scourged and yet not executed;

But I was personally unknown to the churches of Judea that are in Christ.