Definition of blackguardry in English:

blackguardry

(also blaggardry, blackguardery)

noun

rare
  • The behaviour or manner of a blackguard; = blackguardism.

Origin

Early 19th century; earliest use found in Champion (London). From blackguard + -ry.

Pronunciation

blackguardry

/ˈblaɡədri//ˈblaɡɑːdri/