n. [ Block + head. ] A stupid fellow; a dolt; a person deficient in understanding. [ 1913 Webster ]
The bookful blockhead, ignorantly read,
With loads of learned lumber in his head. Pope. [ 1913 Webster ]
a. Stupid; dull. [ 1913 Webster ]
n. That which characterizes a blockhead; stupidity. Carlyle. [ 1913 Webster ]