← BackshareGuessblockheaded/ˈblɑkˌhɛdɪd/adjectiveStupid or foolish; slow to understand.His blockheaded refusal to listen cost him the job.She made a blockheaded mistake by leaving the keys in the car.The plan was so blockheaded that everyone laughed at it.SynonymsstupidfoolishdenseAntonymscleversmart