Lewis & Short

mălĕdĭcax (or separately, mălĕ dĭ-cax), ācis, adj. [male-dicax],

  1. I. foul-mouthed, abusive, slanderous, reviling (ante- and postclass.): maledicax es, Plaut. Curc. 4, 2, 26.
  2. II. Subst., a reviler, slanderer, Macr. S. 7, 3 med.