blackguard

n.

  1. The scullions and lower menials of a court, or of a nobleman's household, who, in a removal from one residence to another, had charge of the kitchen utensils, and being smutted by them, were jocularly called the "black guard"; also, the servants and hangers-on of an army.
  2. The criminals and vagrants or vagabonds of a town or community, collectively.
  3. A person of stained or low character, esp. one who uses scurrilous language, or treats others with foul abuse; a scoundrel; a rough.
  4. A vagrant; a bootblack; a gamin.

v. t.

  1. To revile or abuse in scurrilous language.

a.

  1. Scurrilous; abusive; low; worthless; vicious; as, blackguard language.