thuggish

adjective2

1. •
   Characterized by thuggery; behaving in a violent or intimidating way; appearing to be violent or intimidating.

   • Their thuggish manner made continuing negotiations very difficult.
2. •
   (no longer used) Resembling or characteristic of the assassins known as thugs or thuggees (often capitalized in this sense).

   • There are not wanting in this Christian land The breast remorseless and the Thuggish hand, — 1871