Joseph and Lady Sneerwell are self-interested gossips who use rumors to manipulate others for personal gain:
Joseph Surface wants to marry Maria because she is wealthy, securing his financial future.
Lady Sneerwell desires Charles Surface and schemes to separate him from Maria so she can have him for herself.
To achieve this, they:
Spread false rumors to make Sir Peter Teazle believe that Charles is romantically involved with Lady Teazle, discouraging him from approving Maria's marriage to Charles.
Try to convince Maria that Charles loves Lady Sneerwell, making her reject him.
However, their plot is exposed, and instead of achieving their goals, they become the butt of jokes. Though their manipulation fails, they do not face severe punishment, highlighting the play’s satirical take on scandal and hypocrisy.