Inexpungeable is a word that refers to something that cannot be removed or erased. Some synonyms for this word include indelible, ingrained, permanent, unerasable, and enduring. Indelible refers to things that cannot be rubbed off, washed away or erased, such as ink on paper. Similarly, ingrained refers to things that have become deeply rooted and fixed, such as habits or beliefs. Meanwhile, permanent refers to things that are meant to last forever, while unerasable refers to things that cannot be erased or removed by any means. Finally, enduring refers to things that will continue to exist for a long time, despite any hardships or challenges they may face.