The phonetic transcription of "boastful" is /ˈbəʊstfʊl/ in British English and /ˈboʊstfəl/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "boastful": vainglorious, arrogant, cocky, pompous, braggart.
Example usage of "boastful": "He is a boastful boy, always telling about his toys.". More examples on the page.