Failure to perform an act that should have been performed is called what?

Failure to perform an act that should have been performed is called "nonfeasance." This term is often used in legal contexts to describe a situation where an individual or entity fails to take action when there is a duty to do so, potentially leading to harm or damage. Nonfeasance can result in liability if it is determined that the failure to act was negligent or breached a duty of care.