Deception or falsehoods.
If the defamation (false statements or lies) is spoken then it is considered slander. If the defamation is written, then it is called libel.
Slander
The term for spoken lies about a person is "slander." Slander refers to making false spoken statements that harm someone's reputation.
Diminishes value of what's spoken.
Making false statements about someone is called defamation. Defamation can be further categorized as slander if the false statements are spoken, and libel if they are written or published.
A brad of lies
The title of that 1983 song is simply "Lies." See link below.
British is spoken in Brittany, where it is called Breton, and in Wales, where it is called Welsh.
Pathological lying
A plain that lies along a sea coast is called
Charges can be pressed against people who commit the act of lying under oath. This is known as Perjury and carries harsh penalties such as incarceration. If someone says something about someone that they know is not true and it imputes their character, it is illegal. If the lies are written, it is called libel, and if they are spoken, it's slander.