Lewis & Short

exaspĕrātĭo, ōnis, f. [exaspero],

  1. I. a roughness, Scrib. Comp. 222; Veg. Vet. 5, 61, 1.
  2. II. Bitterness, exasperation, Tert. adv. Marc. 2, 16; Macr. S. 7, 12, 38.