Lewis & Short

ĭn-offĭcĭōsus, a, um, adj., undutiful, inofficious.

  1. I. In gen.
    1. A. Not observant of his duty, undutiful: humana gens inofficiosa dei, Tert. Apol. 40: libertus inofficiosus patrono, Dig. 37, 14, 1.
    2. B. Contrary to one’s duty: testamentum, i. e. one in which nothing is left to one’s nearest relatives, children, etc., Cic. Verr. 1, 42, 107; cf. Dig. 5, 2.
  2. II. In partic., not obliging, disobliging: in aliquem, Cic. Att. 13, 27, 1.