vitiates Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. 1 to harm the quality of; mar; spoil; 2 to make a legal document or the like ineffective or invalid Example Sentence This new evidence vitiates your testimony. Synonyms impair; mar; spoil; taint; tarnish Antonyms enhance Hear It! Say It! Write It! vitiates Switch to cursive Start Share with your friends: