a. Obs. rare. [f. as prec. + -FUL.] Full of treason; treasonous; treacherous.
13[?]. Cursor M., 13960 (Cott.). Þe Iues … wit þair mani tressunful red, þai soght ihesu at do to ded.
1650. Trapp, Comm. Num. xvi. 14. They add rebellion to sin, and justifie their treasonful practices.
