Legal Definitions - frivolous defense

A frivolous defense is a defense that has no basis in fact or law. It is a defendant's stated reason why the plaintiff or prosecutor has no valid case. For example, if a defendant is accused of robbery, but their defense is that they were on the moon at the time of the crime, that would be a frivolous defense.

Frivolous defenses are not taken seriously by the court and are often dismissed quickly. They waste time and resources and can even result in sanctions against the defendant or their attorney.

Other types of defenses include affirmative defenses, which are assertions of facts and arguments that, if true, will defeat the plaintiff's or prosecution's claim, and perfect defenses, which meet all legal requirements and result in the defendant's acquittal.