underperform Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to perform less well than expected or required. Example Sentence The company's sales underperform compared to last year's numbers. More Example Sentences The team did not perform well this season. Synonyms fail; lag; disappoint Antonyms excel; succeed; thrive Hear It! Say It! Write It! underperform Switch to cursive Start Rhymes Four Syllable Rhymes (1) underperform Share with your friends: