boneheaded vs thick-skulled

boneheaded and thick-skulled both are adjectives.

Word	Noun	Adjective	Verb	Adverb
boneheaded	No	Yes	No	No
thick-skulled	No	Yes	No	No

As adjectives, boneheaded and thick-skulled are synonyms defined as:

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

boneheaded (adjective)	thick-skulled (adjective)
(used informally) stupid	(used informally) stupid