thug

Short definition from Wiktionary

Noun

1. 1
   A person who is a member of a gang or criminal organization.
2. 2
   A violent, aggressive, or truculent person.
3. 3
   A criminal that extorts people.
4. 4
   A person who use intimidation to coerce others.
5. 5
   One of a band of assassins formerly active in northern India who worshipped Kali and sacrificed their victims to her.
6. 6
   One who, usually as a result of social disadvantage, has turned to committing crimes (e.g. selling drugs, robbery, assault, etc.) to make a living; a gangsta.
7. 7
   An overvigorous plant that spreads and dominates the flowerbed.
8. 8
   A wooden bat used in the game of miniten, fitting around the player's hand.

Verb

1. 1
   To commit acts of thuggery, to live the life of a thug, to menace, to commit crime.
2. 2
   (often with out) To appear as a thug; to dress and act in a manner reminiscent of a thug.