Avengingly

adv. [f. prec. + -LY².] In an avenging manner, with vengeance, vengefully.

1824.  Galt, Rothelan, III. VI. vii. 71. The same day that he so avengingly visited Sir Amias.

1843.  Blackw. Mag., LIII. 305. Avengingly out from the cloud Come the levin, the bolt, and the ball!