blockheaded vs boneheaded

blockheaded and boneheaded both are adjectives.

Word	Noun	Adjective	Verb	Adverb
blockheaded	No	Yes	No	No
boneheaded	No	Yes	No	No

As adjectives, blockheaded and boneheaded are synonyms defined as:

Other synonyms of blockheaded include duncical, duncish, fatheaded, loggerheaded, thick-skulled, thick, thickheaded, wooden-headed.

blockheaded (adjective)	boneheaded (adjective)
(used informally) stupid	(used informally) stupid