blackguardism
/ˈblaɡɑːdɪz(ə)m/ /ˈblaɡədɪz(ə)m/noun
1Abusive or scurrilous language; swearing. Now historical.
2The characteristic behaviour or manner of a blackguard; ruffianism.
Origin
Mid 18th century. From blackguard + -ism. Compare earlier blackguarding and later blackguardry.