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Definition of acidity : The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.

Synonyms:

sour, sarcasm, moroseness, corrosiveness, laughter, sullenness, trenchancy, acidulousness, respect, mordacity, mordancy, sulkiness

churlishness, irritability, spitefulness, petulance, tartness, causticity, bitchiness, huffiness, sourness, acerbity, surliness, crankiness, irascibility, crabbedness, bearishness, peevishness, bitterness, prickliness, crustiness, cantankerousness, crossness, touchiness, bellicosity, acrimony, pettiness

acridity, unripeness, fermentation, piquancy, harshness, hyperacidity, vinegariness, pungency, keenness, sharpness, acidosis, acridness, astringency

Usage examples:

• So she said with an acidity completely at variance with the promise of her cap, " Ask the Captain," and disappeared. - "Christopher and Columbus", Countess Elizabeth Von Arnim.
• Formerly, on account of its grateful acidity, a conserve was ordered by the London College to be made from the leaves and petals of Wood Sorrel, with sugar and orange peel, and it was called Conserva lujuoe. - "Herbal Simples Approved for Modern Uses of Cure", William Thomas Fernie.
• " I am glad to hear she is kind," said Mr. Lorimer, with a touch of acidity. - "The Bars of Iron", Ethel May Dell.