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Insubordination (is) defiance of an employer's authority including disobeying a lawful order or work assignment, abuse of a supervisor, etc. In my view, the abuse of a supervisor can be physical and/or verbal..
The actual behavior or action that supervisors define as insubordinate depends on the employee-supervisor relationship. Also, the manner in which the supervisor issues the work directive and whether the employee actually understands the supervisor's expectations are factors in identifying insubordinate behavior.