acidity

1 a harsh or sharp quality detected a certain acidity in the way he responded Synonyms acerbity, edge, acidness, acridity, acridness, acrimoniousness, acrimony, acuteness, asperity, bite, bitterness, harshness, keenness, poignance, poignancy, pungency, roughness, sharpness, tartnessRelated Words ginger, punch, spice, tang; raucousness, severeness, severity, shrillness, virulence, vitriol; cattiness, maliciousness; pointedness, thorninessNear Antonyms gentleness, kindlinessAntonyms mildness, softness

2 biting sharpness of feeling or expression the acidity of their relationship was well known to their mutual acquaintances Synonyms acrimony, acidness, acridity, acridness, asperity, bile, bitterness, cattiness, corrosiveness, mordancy, tartness, virulence, virulency, vitriolRelated Words gruffness, harshness, hostility, relentlessness, severity, sternness, vehemence; coldness, crossness, discourteousness, iciness, impoliteness, incivility, nastiness, rudeness, sourness, surliness, ungraciousness; anger, animosity, gall, jaundice, malevolence, malice, rancor, scorn, spite, spleen, venom, vindictiveness; jealousy, pique, resentment, sour grapesNear Antonyms civility, cordiality, courtesy, diplomacy, geniality, graciousness, kindness, politeness, tactfulness; compassion, softness, sweetness, sympathy, tenderness, warmth; oiliness, smoothness, suaveness, suavity, unctuousness, urbanity