flagitious

adjective2

1. •
   (literary) Guilty of terrible crimes; wicked, criminal.

   • This young Nobleman was not only a flagitious Punster himself, but was accessary to the Punning of others, by Consent, by Provocation, by Connivance, and by Defence of the Evil committed […] . — 1716
2. •
   (literary) Extremely brutal or wicked; heinous, monstrous.

   • But if in Noble Minds some Dregs remain, / Not yet purg'd off, of Spleen and sow'r Disdain, / Discharge that Rage on more Provoking Crimes, / Nor fear a Dearth on these Flagitious Times. — 1711