blockheaded vs fatheaded

blockheaded and fatheaded both are adjectives.

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

As adjectives, blockheaded and fatheaded are synonyms defined as:

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

blockheaded (adjective)	fatheaded (adjective)
(used informally) stupid	(used informally) stupid