Thug

1. Someone with an intimidating and unseemly appearance and mannerisms, who treats others violently and roughly, often for hire.
2. One of a band of assassins formerly active in northern India who worshipped Kali and offered their victims to her.
3. In gardening, an over-vigorous plant that spreads and dominates the flowerbed.
4. A punk; a hoodlum; a hooligan.

verb

To commit acts of thuggery, to live the life of a thug, or to dress and act in a manner reminiscent of someone who does.