D defs.my
Entry 1 sense Webster, 1913

Blockhead

/bläk'-hĕdˌ/ · Block·head · IPA /blˈɑkhˌɛd/
01 n. A stupid fellow; a dolt; a person deficient in understanding.
  1. 1.
    A stupid fellow; a dolt; a person deficient in understanding.
    “The bookful blockhead, ignorantly read, With loads of learned lumber in his head.” Pope.