Lewis & Short

intempestus, a, um, adj. [2. in-tempus], unseasonable.

  1. I. Lit.: intempesta nox, the dead of night, Cic. Phil. 1, 3; id. Pis. 38; id. Verr. 2, 4, 43, § 94; Verg. A. 3, 587; id. G. 1, 247 al.; cf. Varr. L. L. 6, § 7; 7, § 72: nox intempesta, quae non habet idoneum tempus rebus gerendis, Macr. S. 1, 3, p. 209 Bip.
    Hence, personified: intempesta silet Nox, dismal Night, the mother of the Furies, Verg. A. 12, 846.
  2. II. Transf.
    1. A. Unwholesome, unhealthy: Graviscae, Verg. A. 10, 184.
    2. B. Stormy, tempestuous: Tonans, Stat. Th. 2, 153.