What is unnamable; indescribable; inexpressible. But what it is, that is not yet known; what I can not name; nameless woe,I wot. Shak. I have a nameless horror of the man. Hawthorne called?

nameless — Unnamable; indescribable; inexpressible. But what it is, that is not yet known; what I can not name; nameless woe,I wot. Shak. I have a nameless horror of the man. Hawthorne. (Webster's 1913.)

Sources