tur·pi·tude /ˈtɜrpɪˌtud, -ˌtyud/

1. vile, shameful, or base character; depravity.
2. a vile or depraved act.

1480–90; < L turpitūdō, equiv. to turpi ( s ) base, vile + –tūdō -tude

1. wickedness, vice, vileness, wrongdoing.

Source: Dictionary.com.

“I propose that such loquacity passes beyond the scope of nuisance and over the verge of turpitude.”

Source: Tales of the Dying Earth by Jack Vance.