Frivolous or vexatious

In law, frivolous or vexatious is a term used to challenge a complaint or a legal proceeding being heard as lacking in merit, or to deny, dismiss or strike out any ensuing judicial or non-judicial processes.

The term is used in several jurisdictions, such as England & Wales, Ireland and New Zealand. While the term is referenced in laws and regulations, it is often not defined by statute, being developed instead by decisions of the courts.