boneheaded vs loggerheaded

boneheaded and loggerheaded both are adjectives.

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

As adjectives, boneheaded and loggerheaded are synonyms defined as:

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

boneheaded (adjective)	loggerheaded (adjective)
(used informally) stupid	(used informally) stupid