beknownst

Probably a back-formation from unbeknownst.

• IPA^(key): /bɪˈnoʊnst/

beknownst (not comparable)

1. (followed by the preposition to) Known; In (someone's) awareness.
   • 1994 July 25, Jack Winter, “How I met my wife”, in The New Yorker:

     Beknownst to me, the hostess, whom I could see both hide and hair of, was very proper, so it would be skin off my nose if anything bad happened.

   • 2003, K.S. McCoy, My Mind's Eye‎, →ISBN, page 37:

     Upon her 21 birthday as she had asked the gypsy came to her with her book of spells and on the rising of the night star she did take Angelique deep into the woods where beknownst to only them she performed a ritual so old and ancient that most of her own kind no longer knew it existed.

   • 2008, Miles Hawke, The Dragonnade‎, →ISBN, page 56:

     Then for reasons best beknownst to him, the batman took note of the woman's presence and then tried to shrug off the glamour o’ sea.

   • 2011, Edward F. Cassidy, Looking Back on Tomorrow: A Life Story‎, →ISBN, page 111:

     Little beknownst to either of them, they were being followed by a very clumsy, wet, and muddy-pawed mutt, the Cassidy hound.

• best-known