vitiate Get Printable Handwriting (vi-ti-ate) 3 syllables 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 They thought the rough company would vitiate her character. Synonyms impair; mar; spoil; taint; tarnish Antonyms enhance Share with your friends: