slandersome

adjective1

1. •
   (dialect, informal) Characterised or marked by slander.

   • “You're a slandersome rascal, an' I'll no stand to ca' quarrels wi you; I tell you, sir, you're potchin'an' trespassin' upo' my property, whare you've nae right to set a fit without my leave.” — 1823