loggerheaded vs blockheaded

loggerheaded and blockheaded both are adjectives.

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

As adjectives, loggerheaded and blockheaded are synonyms defined as:

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

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