thickheaded vs wooden-headed

thickheaded and wooden-headed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
thickheaded	No	Yes	No	No
wooden-headed	No	Yes	No	No

As adjectives, thickheaded and wooden-headed are synonyms defined as:

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

thickheaded (adjective)	wooden-headed (adjective)
(used informally) stupid	(used informally) stupid