bestie Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a close friend or companion who is very dear. Example Sentence My bestie and I have been friends since kindergarten. More Example Sentences A bestie is someone you can trust. Synonyms friend; buddy; pal Antonyms enemy; foe Hear It! Say It! Write It! bestie Switch to cursive Start Share with your friends: