The phonetic transcription of "empty-headed" is /ˌempti ˈhedɪd/ in British English and /ˌempti ˈhedɪd/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "empty-headed": foolish, frivolous, brainless, vacuous, silly.
Example usage of "empty-headed": "She seems a bit empty-headed, but she's actually very smart.". More examples on the page.