A dropdead list is also known as a blacklist, ban list, or exclusion list. It is a list of people or things that are not allowed or tolerated in a particular situation or environment. Another synonym for the dropdead list is a no-fly list, which is a list of individuals who are not permitted to fly due to security concerns. In the business world, a dropdead list can also be referred to as a do-not-do list or a non-essential list. Whatever the name may be, the purpose remains the same: to identify those who pose a risk or threat and to take action accordingly.