Treasonably

adv. [f. prec. + -LY².] In a treasonable manner. (Orig. Sc.)

c. 1375.  Sc. Leg. Saints, xxvi. (Nycholas), 786. Þat cristine man tuk in hy Þe ymag þare tresonably.

c. 1470.  Henry, Wallace, VII. 914. Syne held it lang, quhill tratouris tresonably Causit his dede.

1549.  Compl. Scot., viii. 72. Tha deserue as grite reproche as tha hed sellit traisonablye the realme to there enemeis.

1660.  Trial Regic., 17. Did Maliciously, Treasonably, and Feloniously … condemn our late Soveraign Lord King Charls the First.

1839.  G. P. R. James, Louis XIV., III. 18. The government of Mazarin … was treasonably assailed.

1884.  Manch. Exam., 14 May, 5/2. It was said that French military plans had been treasonably revealed.