The word unerasable refers to something that cannot be erased or removed. There are several synonyms for this word that can be used interchangeably. These include: permanent, indelible, immovable, irremovable, nonremovable, fixed, ineradicable, indestructible, firm, steadfast, resolute. All of these words suggest a sense of permanence or immovability. For example, a permanent marker is unerasable and leaves a permanent mark on its surface. Similarly, a resolute decision is unerasable and cannot be changed. The use of synonyms helps to enhance the depth and clarity of writing, providing a wider range of words to express a particular idea or concept.