undesirable

An undesirable person or thing is someone or something that's not wanted or acceptable.

The word "undesirable" can sound pretty harsh, but it's often used to describe things we don't want around us. For instance, if you're renting an apartment and there are some noisy neighbors who like to party all night, they might be considered undesirable roommates because they disrupt the peace. Or, if a company decides not to hire someone with a certain behavior or attitude, that person could be seen as undesirable for the job. Even a product can be deemed undesirable if it's faulty or doesn't work well – you wouldn't want to buy something like that!