blackguard

The lowest servant in a household charged with pots, pans, and other kitchen equipment.

An unprincipled, contemptible person; an untrustworthy person.

1830, Thomas Macaulay, Review of Robert Southey's edition of Pilgrim's Progress, in the Edinburgh Review A man whose manners and sentiments are decidedly below those of his class deserves to be called a blackguard.

Pawn another man's property for the sake of a meal, eat and drink one's self to perdition, brand one's soul with the first little sear, set the first black mark against one's honour, call one's self a blackguard to one's own face, and needs must cast one's eyes down before one's self? Never! never!

A man who uses foul language in front of a woman (typically a woman of high standing).

To revile or abuse in scurrilous language.

Persons who passed each other in boats upon the Thames used to blackguard each other, in a trial of wit

The Southern Region takes, in the main, a candid line with its public. […] An ill-informed attempt to blackguard the railway publicly is likely to see the complainant put politely—but very firmly—in his place.

To act like a blackguard; to be a scoundrel.