n.
1.
Sourness, astringency, roughness, acidity, acidness, tartness, acridity, acridness, bitterness.
2.
Acrimony, acrimoniousness, severity, harshness, sternness, asperity, bitterness, venom, rancor, crabbedness, churlishness, moroseness, sullenness, ill-temper.