Final answer:
A person who fails to show up for an appointment without prior notification is referred to as a 'no-show'. This behavior can convey a lack of preparation and a negative attitude, potentially leading to disrupted plans and inconvenience for others.
Step-by-step explanation:
A person who fails to keep an appointment without giving advance notice is called a no-show. This term is used to describe an instance when someone does not appear for a scheduled appointment, meeting, or event and they do not provide any previous notification of their absence. This can be frustrating for those who have prepared for the appointment and can be considered unprofessional or discourteous.
Proper etiquette and professionalism often require that if one is unable to attend a scheduled commitment, they should inform the relevant parties in advance; this is to facilitate a reschedule or allow for a cancellation to be properly processed. A disruption occurs when an event is interrupted or hampered, though this is not specifically related to missing an appointment. Ultimately, failing to attend an appointment without notice reflects a lack of preparation and can convey a negative attitude or a lack of enthusiasm towards the commitment.