Lewis & Short

mălĭtĭōsus, a, um, adj. [malitia], full of wickedness, wicked, knavish, crafty, malicious.

  1. I. In gen. (class.): homo, Cic. Off. 3, 13, 57: malitiosissimus, Front. ad M. Caes. 4, 3.
    Of things: juris interpretatio, Cic. Off. 1, 10, 33.
  2. II. As nom. prop.: Silva Malitiosa, a forest in the Sabine territory, Liv. 1, 30, 9; = ὕλη κακοῦργος, Dion. 3, 33.
    Hence, adv.: mălĭtĭōsē, wickedly, knavishly, perfidiously: quicquam agi dolose, aut malitiose, Cic. Off. 3, 15, 61: facere aliquid, id. Verr. 2, 2, 53, § 132.
    Comp.: rem mandatam malitiosius gerere, Cic. Rosc. Am. 38, 111.