If you describe a place, organization, or activity as impersonal, you mean that it is not very friendly and makes you feel unimportant because it involves or is used by a large number of people.

If you describe someone's behaviour as impersonal, you mean that they do not show any emotion about the person they are dealing with.

An impersonal room or statistic does not give any information about the character of the person to whom it belongs or relates.