Which term best describes a failure to act that leads to negative consequences in a professional setting?

The term that best describes a failure to act that leads to negative consequences in a professional setting is "Omission." In legal and professional contexts, an omission refers specifically to a situation where an individual or organization fails to take action when they are required to do so, which can result in harm or adverse outcomes.

For example, if a process server neglects to deliver important legal documents on time, that failure to act—an omission—can have serious implications for the parties involved in a legal case. This highlights the importance of proactive behavior in ensuring responsibilities are met.

While "failure to act," "inaction," and "negligence" all relate to a lack of action, they do not convey the specific legal connotation of omission in the way it is understood in a professional setting. Omission implies a legal or contractual duty that has not been fulfilled, making it the most precise term in this context.