Lewis & Short

obnoxĭōsus, a, um, adj. [obnoxius] (ante-class.).

  1. I. Subject, submissive, obedient: alicui, Plaut. Trin. 4, 3, 31.
  2. * II. Hurtful, injurious, dangerous: res, Enn. ap. Gell. 7, 17, 10 (Trag. v. 341 Vahl.).
    Hence, adv.: obnoxĭōsē, abjectly, timidly.
    Comp.,     obnoxiosius, Plaut. Ep. 5, 2, 30.