Green’s Dictionary of Slang

impudence, impertinence, thus adj. imperent ; also in direct address (see cit. 1836–7).

1766		Colman & Garrick Clandestine Marriage V ii: I wonder at your impurence, Mr. Brush, to use me in this manner.
1821		Egan Life in London (1869) 221: She is blowing up the nasty fellow for his imperance.
1830		Egan Finish to the Adventures of Tom and Jerry (1889) 185: Damn your imperance! [...] you great pot-bellied cormorant.
1835		Sydney Herald 18 June 4/2: [M]y eyes how you did tip him the gobbox about imperdence, and when he wouldn't give you the go by, about morals and jistice, and equality, and sich like big words.
1838		R.S. Surtees Jorrocks Jaunts (1874) 133: An irate look and a shake of his cane from Green, with a mutter of something about ‘imperance’.
1838		Crim.-Con. Gaz 1 Sept. 23/1: She say [...] him dam imperent fellow.
1843–4		Dickens Martin Chuzzlewit (1995) 757: ‘Why, deuce take your imperence,’ said Mrs. Prig.
1848		Bell’s Life in Sydney 16 Sept. 3/4: I won’t pay a mag for your imperance.
1855		Bell’s Life in Sydney 14 Apr. 3/2: And as upon one occasion, he carried his ‘imperance’ too far, she gave him into custody.
1858		A. Mayhew Paved with Gold 126: I shall do nothing of the kind, for your imperence.
1865		Leaves from Diary of Celebrated Burglar 17/2: Get up a dance at my expense, eh? Blast thee bloody imperence.
1867		Grey River Argus )NZ) 24 Aug. 2/6: The imperence o’ these ere dancing gurls!
1873		Sl. Dict. 199: Imperence servant girl currency for impudence or impertinence. ‘Now, then, Mr. imperence, leave off now, do,’ seems, however, to have faded away with Greenwich, Bartlemy, and kindred fairs.
1880		Bulletin (Sydney) 1 May 5/3: The first woman we ever proposed to boxed our ears and dratted our imperence.
1884		Ally Sloper’s Half Holiday 21 June 60: [caption] Did he mean it for imperence?
1891		in Punch 10 Jan. 18: But, really, of all the dashed imperence.
1894		‘Price Warung’ Tales of the Early Days 285: Like yer imperence, Jim Hughes [...] interferin’ with wot ain’t yer business.