Excessive sternness can be described as having a rigid attitude or demeanor that is overly strict and unyielding. The term 'RIGOR' is often used to describe this type of behavior, which is characterized by an unwillingness to compromise or show leniency. This attitude can be seen in many different contexts, such as parenting, teaching, and even in the workplace. It can lead to a lack of trust and respect between people, and can create an atmosphere of fear and intimidation.