bare-knuckle

Short definition from Wiktionary

Adjective

1. 1
   Without boxing gloves.
2. 2
   Characterized by ruthlessly attacking or overpowering an opponent, especially when using underhanded techniques.
3. 3
   Alternative form of bare-knuckle: Without boxing gloves
4. 4
   Alternative form of bare-knuckle: Ruthlessly competitive

Verb

1. 1
   To box without boxing gloves.
2. 2
   To attack or overpower ruthlessly.
3. 3
   Alternative form of bare-knuckle.