Definition of Defamatory: Defamatory is the act of making a false statement that harms the reputation of an individual or group. Defamatory statements can be made in writing, orally, or by gesture. There are three types of defamatory statements: libel, slander, and false light. Libel is a false written statement that harms the reputation of an individual or group. Slander is a false spoken statement that harms the reputation of an individual or group. False light is a false portrayal of an individual or group that is offensive or embarrassing.