*acerbity*

n. [ F. acerbité, L. acerbitas, fr. acerbus. See Acerb. ] 1. Sourness of taste, with bitterness and astringency, like that of unripe fruit. [ 1913 Webster ]

2. Harshness, bitterness, or severity; as, acerbity of temper, of language, of pain. Barrow. [ 1913 Webster ]