blockheaded vs loggerheaded

blockheaded and loggerheaded both are adjectives.

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

As adjectives, blockheaded and loggerheaded are synonyms defined as:

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

blockheaded (adjective)	loggerheaded (adjective)
(used informally) stupid	(used informally) stupid