full well en · ADV
Etymology
From Middle English fol wel, fulwel, from Old English ful wel, equivalent to full + well. Compare Old Norse all-vel (“full well”).
Meanings
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(not-comparable) Very well
2006. Nadia Yassine. Full Sails Ahead. Justice and Spirituality Publications. page 2. He knows full well that I don't like that club.
It also means that when a right-wing Jewish group such as the ZOA chooses to overlook Bannon’s well-documented links to anti-Semitic white nationalists, it puts itself on a moral par with J.V.P. Bannon is the man who expressly called Breitbart News “the platform for the alt-right,” knowing full-well the toxic range of opinion encompassed by the term.
2017 November 16, Bret Stephens, “Steve Bannon Is Bad for the Jews”, in The New York Times, archived from the original on 18 Nov 2017:He is so fayre, withoutten les, / he semys full well to sytt on des.
15th c., “[The Creation]”, in Wakefield Mystery Plays; Re-edited in George England, Alfred W. Pollard, editors, The Towneley Plays (Early English Text Society Extra Series; LXXI), London: […] Oxford University Press, 1897, →OCLC, page 5, lines 120–121:Besides, there is always a tendency—indeed an interest—to take on what one knows full well.
1829, Charles Burroughs, Memoirs and select papers of Horace B. Morse, Miller and Brewster, pages 83–87: