1. (noun)sour, sourness, tartness the taste experience when vinegar or lemon juice is taken into the mouth Synonyms: sourness, acrimony, moroseness, sulkiness, bitterness, acidity, tartness, sour, sullenness, jaundice, acerbity, thorniness
1. tartness Acerbity is a sharpness, with a touch of bitterness, which may arise from momentary annoyance or habitual impatience; asperity is keener and more pronounced, denoting distinct irritation or v Synonyms: acrimony, acerbity, harshness, severity, tartness, asperity, malignity, sharpness, unkindness, bitterness, moroseness, sourness, virulence, causticity Antonyms: amiability, gentleness, kindness, smoothness, courtesy, good nature, mildness, sweetness
Synonyms for tartness 
