The phonetic transcription of "numskull" is /ˈnʌmskʌl/ in British English and /ˈnʌmskʌl/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "numskull": idiot, dunce, blockhead, nitwit, fool.
Example usage of "numskull": "Don't be a numskull, close the door!". More examples on the page.