blackguard UK /ˈblæɡəd/US /ˈblæɡɚd/noun 3verb 2forms 3 noun3 •(old-fashioned) An unprincipled, contemptible person; an untrustworthy person.A man whose manners and sentiments are decidedly below those of his class deserves to be called a blackguard. — 1830 •(historical) The lowest servant in a household charged with pots, pans, and other kitchen equipment. •(no longer used) A man who uses foul language in front of a woman (typically a woman of high standing). verb2 •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 — 1850 •To act like a blackguard; to be a scoundrel. formsblackguarded · blackguarding · blackguards