The word "thickheaded" in English means: Stupid or not able to understand things easily., Unwilling to learn or accept new ideas; stubborn..
The phonetic transcription of "thickheaded" is /ˌθɪkˈhed.ɪd/ in British English and /ˌθɪkˈhed.ɪd/ in American English. Click the 🔊 button to hear both pronunciations.