Positively, i.e. not just privatively, evil

"the evil that constitutes a difference of habits is not [the] pure privation [common to every fallen being], but something determinate [repugnant] to a determinate nature", in this case human nature."

"malum quod est differentia constitutiva habitus, non est privatio pura, sed est aliquid determinatum repugnans determinatae naturae."

     St. Thomas Aquinas, Summa theologiae I-II.54.3.ad 2, as trans. FEDP (Shapcote).  Latin from Corpus Thomisticum.