Definition of "envenomed"

[…] we do not believe that tradition itself, carried back to the earliest record, could come forth with an example more virulent in design, more dark in motive, more envenomed in prosecution, nor more incongruous in accusation, than the Charges and Impeachment of the late Governor General of Bengal.

1787, A Retrospect of the Portraits Lately Delineated in a Pamphlet Called A Short Review of the Political State of Great-Britain, pages 66–67

His early school experiences in the house of the English clergyman at Wimbledon had disgusted him as a boy, and to the last he was very envenomed against the English clergy, whom he charged with express stultification of the people.

1888, “Arthur Schopenhauer (Feb. 22, 1788–Sept. 21, 1860)”, in The Cornhill Magazine, volume 11, page 43

Imrédy had hardly entered high politics before he had accumulated a host of personal ill-­wishers besides many envenomed political and financial opponents of his programme.

1956, Carlile Aylmer Macartney, October Fifteenth: A History of Modern Hungary, 1929–1945, volume 1, page 107