Green’s Dictionary of Slang

damnably adv.

also damnable
[prior use from 16C is SE]

a general intensifier.

[[UK]Shakespeare Winter’s Tale III ii: That did but shew thee, of a foole, inconstant, And damnable ingratefull].
[[UK]Massinger & Fletcher The Double Marriage V i: I am damnably hungry].
[UK]G. Colman Yngr John Bull II i: The rising generation wants a new dictionary, damnably.
[UK]Beppo in London cii: Even C—lm—n [...] Declar’d ‘’twould d—nably annoy the fools!’.
[UK] ‘The Margate Hoy’ The Universal Songster I 6: Oh, I’m damnably sick!
[UK]J.J. Stafford Love’s Frailties II i: What a damnable unfortunate fellow I am!
[UK]Lytton Lady of Lyons II i: Now you understand me, My dear, most dear---Oh damnably dear Sir!
[UK]D. Boucicault London Assurance in London Assurance and Other Victorian Comedies Act II: I am only in the habit of receiving compliments from the fair sex. Men’s admiration is so damnably insipid.
[Ire]Waterford Mail 13 May 3/4: Either Dr Gray or Mr Scully must therefore have lied wilfully and ‘most damnably’.
[US]G.W. Harris Sut Lovingood’s Yarns 190: The thing got tu be durn’dably mix’d up.
[Scot]Dundee Courier 13 Dec. 3/6: he hadbrought a charge against a fellow-constable, and altogether behaved ‘most damnably’.
[UK]Gloucester Citizen 18 Nov. 3/5: The last of whom are still taking milk from mother’s chest, and are damnably noiseful.
[US]Orleans Co. Monitor (Barton, VT) 21 June 6/3: The most damnably corrupt thing on earth is American politics.
[UK]Yorks. Eve. Post 18 Feb. 6: I am damnably well up in precise writing, drafting [...] and office work.
[UK]Birmingham Gaz. 3 July 4/7: Probably the chief secret of Darwin’s happy marriage is that the wife [...] was not ‘damnably clever’ as Mrs Carlyle was.
[UK]A.A. Milne Dover Road in Three Plays (1922) Act I: It’s interfering of me, damnably interfering.
[UK]E. Arnot Robertson Ordinary Families 259: Damnably unfair, but that doesn’t matter.
[US]News (Frederick, MD) 3 Sept. 11/2: It complicated the situation damnably.
[US]S.J. Perelman Westward Ha! 79: It was most damnably hot.
[Scot]Aberdeen Eve. Exp. 4 Sept. 5/4: He was still damnably tired.
[UK]P. Barnes The Ruling Class I xv: We Gurneys have always been damnably virile.