Green’s Dictionary of Slang

blockheaded adj.

also blockheadly, chunk-headed
[blockhead n.1 ]

stupid.

[UK]T. More Utopia II (1624) 96: But now most blockheaded asses be set to learning.
[UK]U. Fulwell Art of Flattery 2nd dialogue 6: I haue been a block-hedly schollar all daies of my life.
[UK]‘Philip Foulface’ Bacchus’ Bountie in Harleian Misc. II (1809) 306: With him came the blockheaded Baltronus [...] and that old huddle and twang Aristodemus.
[UK]R. L’Estrange Fables of Aesop CXLIII 145: Well (says a Blockheaded Boy) These are Villanous Creatures sure, to Sing when their Houses are a-fire.
[UK]Shadwell Squire of Alsatia [dramatis personae] Captain Hackum. Mr. Bright. A Block-headed Bully of Alsatia; a cowardly, im­pudent, blustring fellow.
[UK]T. Shadwell Epsom Wells II i: I believe there is no Village but sins as much [...] only your Country sins are something the more block-headed sins.
[UK]Humours of a Coffee-House 20 Aug. 8: I should have been at least Twenty Lines to the poorer for him, and that’s no small loss to a Poet in such a Blockheadly Age.
Letter from a Friend in Jamaica 6: He is a monstrous absurd Fellow, by G-d; a busy, bustling, blockheaded Booby.
[UK]T. Whittell ‘A Song’ Poetical Works 159: She’s a dull blockheaded jade.
[US]H.S. Truman letter 30 Jan. in Ferrell Dear Bess (1983) 70: You ought to see me teach blockheaded Masons how to talk.
[US]E. Pound letter Sept. in Paige (1971) 122: They are neither of them stupid, blockheaded as F--- and Lawrence are stupid and blockheaded.
[US]E. Pound letter 18 Feb. in Paige (1971) 239: An endeavour to communicate with a blockheaded epoch.
[US]E. Dundy Dud Avocado (1960) 221: I had some crazy idea of expiating my block-headedness once and for all by ‘going through with it’. It would teach me the lesson of my lifetime.
[Aus]G. Hamilton Summer Glare 192: Dookie’s yer sister, yewr big block-headed bastard.
[NZ]J. Boswell Ernie and the Rest of Us 140: Ernie the feudal baron, with his chunk-headed serfs!
[US]‘Red’ Rudensky Gonif 97: Only a block-headed Irishman wouldn’t recognize the value of surprise.
[US](con. 1967) Bunch & Cole Reckoning for Kings (1989) 65: Taliaferro, being the blockheaded son of a bitch he was, still wasn’t tracking.
[US]Week (US) 8 June 25: This ‘blockheaded, hollow-hearted industrial enterprise’ of a movie.