https://www.merriam-webster.com/thesaurus/thickheaded
THICKHEADED Synonyms: 161 Similar and Opposite Words | Merriam-Webster Thesaurus
Synonyms for THICKHEADED: dumb, stupid, slow, simple, thick, ignorant, foolish, dull; Antonyms of THICKHEADED: intelligent, brilliant, clever, smart, apt,...
opposite wordsmerriam webstersynonymssimilarthesaurus