Blackguard

Part of speech: noun (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. [Obs.] A lousy slave, that . . . rode with the black guard in the duke's carriage, 'mongst spits and dripping pans. Webster (1612).

2. The criminals and vagrants or vagabonds of a town or community, collectively. [Obs.]

3. A person of stained or low character, esp. one who uses scurrilous language, or treats others with foul abuse; a scoundrel; a rough. A man whose manners and sentiments are decidedly below those of his class deserves to be called a blackguard. Macaulay.

4. A vagrant; a bootblack; a gamin. [Obs.]

Part of speech: verb (v.)

To revile or abuse in scurrilous language. Southey.

Part of speech: adjective (a.)

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