brainiac Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a very intelligent person who is exceptionally smart. Example Sentence He is the brainiac of our family. More Example Sentences Everyone admired the brainiac in class. Synonyms genius; whiz; prodigy Antonyms dunce; simpleton; fool Hear It! Say It! Write It! brainiac Switch to cursive Start Share with your friends:
