loggerheaded vs boneheaded

loggerheaded and boneheaded both are adjectives.

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

As adjectives, loggerheaded and boneheaded are synonyms defined as:

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

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