Lewis & Short

ācrĭtūdo, ĭnis, f. [2. acer], the quality of acer, sharpness.

  1. I. Lit., of a fluid, Vitr. 2, 9, 12; 8, 3, 18 sq.
  2. II. Trop.
    1. A. Liveliness, vivacity, force: vigor et acritudo populi Romani, Gell. 10, 27: haut quisquam potis est tolerare acritudinem, Att. ap. Fest. p. 356 Müll. (Rib. Trag. Rel. p. 196).
    2. B. Harshness of character: morum, App. M. 9, 224.