Green’s Dictionary of Slang

a fool, also as term of address; their stupidity.

1712		R. Steele Spectator No. 468 6: Thou art no longer to drudge in raising the Mirth of Stupids, who know nothing of thy Merit, for thy Maintenance .
1819		Metropolis I 222: His loudest applauders were [...] stupids, like Sir G. W. who scarcely could speak a word of French [OED].
1824		Pierce Egan’s Life in London 21 Nov. 342/2: Quin, who was driving his coach close behind him, called out—‘Are you going on there, you stoopid!’ Mr. Walbourn replied that he was not.
1837		Thackeray Ravenswing (1887) 86: What an old stupid Roundtowers is!
1851		Bell’s Life in London 8 June 5/4: I say, shtupid, don’t y’e hear his honour tellin’ y’e to aise the head sheets.
1858		F.W. Farrar Eric II 215: ‘There’s only old Stupid,’ whispered he, irreverently designating an under-master named Harley.
1865		H. Kingsley Hillyars and Burtons (1870) 239: You ridiculous old stupid.
1876		Blackburn Times 12 Feb. 2/2: ‘Look here, you stupid,’ she exclaimed.
1888–94		‘Walter’ My Secret Life (1966) VII 1480: The little stupid, who might have had the pleasure of a fuck, and profit as well.
1896		G.M. Fenn Sappers and Miners 146: Lie down, you old stupid!
1901		Bulletin (Sydney) 7 Dec. 36/2: Of course, I do. What a stupid I am.
1903		Jasper Wkly Courier (IN) 25 Sept. 3/1: ‘Fred, you old stupid’.
1932		‘William Hatfield’ Ginger Murdoch 194: You old stupid!
1942		A. Christie Body in the Library (1959) 126: He’s such a dear old stupid.
1959		J. Thompson Getaway in Four Novels (1983) 60: How d’you like the way I handled stupid?
1963		C. Cooper Jr ‘Yet Princes Follow’ in Black! (1996) 238: Only after he’d finished and yelled at her, ‘Right, stupid?’ did she speak.
1973		B. Yanovsky Dark Fields of Venus 125: ‘But why Krishna, why not Christ?’ I inquired anxiously. ‘Krishna is the father of Christ, stupid!’.
1986		Sophiatown in M. Orkin At the Junction (1995) 145: Moegoes nou moet voetsak – All the stupids must bugger off now.
1987		in Delacoste & Alexander Sex Work (1988) 72: She’s just like anyone else out there, stupid.
1995		D. Lodge Therapy (1996) 42: ‘Because I hide it in my handbag, stupido,’ Amy said.
2000		Guardian Rev. 8 Jan. 9: A murderous gang of stupids would be ‘too stupid to realise they are stupid’.
2011		F. Bill ‘Hill Clan Cross’ in Crimes in Southern Indiana [ebook] ‘Turn around. Tired of lookin’ at all your stupid’.