Lewis & Short

exīlĭtas, ātis, f. [exilis],

  1. I. thinness, meagreness, weakness, poorness (class.): aculei apum, Plin. 11, 2, 1, § 3: foliorum, id. 24, 19, 118, § 178: soli, Col. 18, 16, 6: femineae vocis, Quint. 1, 11, 1; cf. id. 11, 3, 19: quarundam litterarum (opp. pinguitudo), id. 1, 11, 4
  2. II. Transf., of speech, etc.: in dicendo (opp. ubertatem et copiam), Cic. de Or. 1, 12, 50; cf. id. Brut. 82, 284.