What Is the Definition of Insubordination?
Insubordination refers to a refusal to obey orders or a display of disrespect towards someone in a position of authority. This behavior might manifest as outright refusal to perform a task, non-compliance with company policies, or verbal or non-verbal conduct that undermines authority. (From Career Sidekick Article – Link Below, Emphasis Added)
Gross Insubordination
Gross insubordination represents a severe breach of workplace conduct, usually involving a direct and serious challenge to authority or an egregious violation of company policy. It is often a culmination of smaller insubordination incidents or a single, highly serious incident.
Example: An extreme case could involve an employee not only refusing to follow a direct order but also engaging in threatening behavior towards their superior. For instance, during a heated discussion, an employee might say, “I’m not doing it, and you can’t make me,” coupled with aggressive posturing or even physical intimidation. (From Career Sidekick Article – Link Below, Emphasis Added)

REFERENCES:

https://www.aihr.com/blog/insubordination

https://careersidekick.com/a-guide-to-addressing-insubordination-in-the-workplace
“Revenge of the Staff” Article by the Wausonian
This post is the opinion of David Baker