What term would you use to describe something that is regarded as unacceptable?

The term "intolerable" is used to describe something that is regarded as unacceptable because it conveys a strong sense of something being impossible to endure or accept. When a situation, behavior, or condition is labeled as intolerable, it indicates that it surpasses a certain threshold of acceptability and cannot be accommodated without significant discomfort or conflict. This term is often used in contexts where ethical, social, or personal boundaries are crossed, demanding a strong response or change.

The other terms do not carry the same connotation of unacceptability. "Unbearable" suggests that something is extremely difficult to withstand, but it does not specifically imply it is unacceptable in the same way as "intolerable." "Permissible" indicates something that is allowed or accepted, which is the opposite of what is being asked. "Manageable" refers to being able to cope with or control a situation, suggesting that even if it may be challenging, it does not reach the level of being unacceptable.