Lewis & Short

1. lŭpīnus, a, um, adj. [lupus],

  1. I. of or belonging to a wolf, wolf’s: ubera, Cic. Cat. 3, 8, 19: juba, Prop. 4 (5), 10, 20: pellis, Plin. 28, 19, 78, § 257.
  2. II. Transf., like a wolf: impetus, Enn. ap. Don. Ter. Phorm. 2, 2, 25 (Sat. v. 28 Vahl.): rictus, Prud. στεφ. 2, 98.