1909 7 Feb. 10/4 Messrs. Blaxter and Kerr found the aldermen greedy and of extraordinary boneheadedness.
1923 P. G. Wodehouse xiii. 212 The wilful bone-headedness of our fellows.
2012 (Nexis) 7 Nov. (Letters section) For sheer boneheadedness this takes a lot of beating.