unknown
/ʌnˈnoʊn/ adjective A2- Not known; unidentified; not well known. · The concept has existed since times unknown.
From the library
What happened in the world before that time is all unknown to me.
He was the more noticed as being the only friend of the past unknown life of Mr.
“I was about to say, as he is unknown to the public.”
As he thus reflected, he felt the sensation we have described, and which had hitherto been unknown to him, arise in his bosom, and fill him with vague apprehensions.
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