Grade 5 boastful Get Printable Handwriting (boast-ful) 2 syllables Rhymes Learn It! Spelling Test Definition adjective. 1 inclined to brag 2 exhibiting self-importance Example Sentence The winner was not boastful. Synonyms bragging; proud; showing off Antonyms humble Rhymes Two Syllable Rhymes (1) boastful Share with your friends: