Which term refers to something incapable of being erased or removed?

Indelible is the term that refers to something incapable of being erased or removed. This word is often used to describe marks or impressions that are permanent, such as ink stains or memories. In a broader context, it signifies the idea of lasting impact or significance.

For instance, indelible ink is used in pens designed for document signing or other purposes where permanence is required, emphasizing that once applied, it cannot be easily wiped away. This characteristic makes "indelible" a strong term in any scenario where permanence is desired or necessary.

The other options describe different qualities: transitory refers to something fleeting or temporary, mutable indicates the capacity for change, and erasable suggests that something can be removed. None of these terms convey the permanence that indelible does.