beknownst

Axin' yer pardin, Misther O'Brien, but 'tis well beknownst to a jintleman of your exthraordinady mintal an' quizzical fackilties that the consthruction of the words consthitutes the differ of langwidged, of which pothooks an' hangers is the ilimints.

1854, Sylvanus Urban, “A Great Mulrooney Story”, in Godey's Lady Book

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.

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

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.

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

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

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