Synonyms for Blockhead:

n.

joker, maniac, dumb blond, numpty. thickhead, chump, ability, DUMBO, dummkopf. blockhead (noun)
hammerhead, bonehead, dunce, loggerhead, knucklehead, muttonhead, numskull, lunkhead, dunderhead.
bungler (noun)
bumbler, botcher, goof, clodhopper, oaf, yokel, fumbler, blunder-head, butter-fingers, clown.
dummy (noun)
moron, bonehead, oaf, dolt, knucklehead, nincompoop, fool, numskull, simpleton, dunce, chump.
fool (noun)
clod, crackpot, nitwit, dumbbell, bonehead, loon, dummy, lame-brain, cretin, imbecile, half-wit, knuckle-head, nincompoop, chuckle-head, dolt, fool, dullard, meathead, simpleton, bungler, ignoramus, moron, dimwit, dunce.
ignoramus (noun)
birdbrain, scatterbrain, buffoon.
person (noun)
hammerhead, bonehead, dunce, loggerhead, knucklehead, muttonhead, numskull, lunkhead, dunderhead.
stupid person (noun)
dolt, clod, chump, dummy, dunce.

Other synonyms:

chump, thickhead, DUMBO, dummkopf. Other relevant words:
joker, maniac, dummkopf, hammerhead, ability, chump, muttonhead, dunderhead, lunkhead, numpty, loggerhead, thickhead, knucklehead, numskull, DUMBO.

Usage examples for blockhead

  1. Dick told me at the bank that he was going to invite you, and then that young blockhead called for you." – The Desired Woman by Will N. Harben