Definition from Wiktionary, the free dictionary
- In a damnable manner.
- 1478, Geoffrey Chaucer, The Canterbury Tales, The Parson's Tale, section 38 
- I kan nat seye but that they doon cursedly and dampnably agayns Crist and al the feith of hooly chirche.
- c. 1597, William Shakespeare, Henry IV, Part 1, Act IV, Scene 2, 
- I have misused the king's press damnably.
- 1759, Charles Macklin, Love a la Mode, Act II, 
- The people were in hopes he had killed the lawyers, and were damnably disappointed when they found he had only broke the leg o' the one, and the back of the other.
- 1826, Allan Cunningham, Paul Jones, Edinburgh: Oliver & Boyd, Volume II, Chapter V, p. 145, 
- But I am blabbing damnably; come, tell me one little bit of the story, and I shall tell you the rest.
- 1912, George Bernard Shaw, Pygmalion, Act II, 
- By the way: my dressing-gown smells most damnably of benzine.
- 1918, Hugh Walpole, The Green Mirror, New York: George H. Doran, Book I, Chapter VI, p. 109, 
- The young man was so damnably full of his experiences, so eager to compare one thing with another, so insistent upon foreign places and changes in England and what we'd all got to do about it.
- 1922, D. H. Lawrence, Aaron's Rod, New York: Thomas Seltzer, Chapter XVIII, p. 307, 
- And in his male spirit he felt himself hating her: hating her deeply, damnably.
- 1478, Geoffrey Chaucer, The Canterbury Tales, The Parson's Tale, section 38