IPA: /ɪnˈɛkspʌndʒəbl/
KK: /ɪnˈɛkspʌndʒəbl/
Something that cannot be removed or erased.
The memories of that day are inexpungible, forever etched in my mind.
Inexpungible → It is formed from "in-" (meaning not) and "expungere" (meaning to erase or blot out) and the suffix "-ible" (meaning capable of). The word "inexpungible" means not capable of being erased or removed.
Think of something that cannot be 'erased' ('expungere') — the 'in-' means not, so 'inexpungible' describes something that cannot be removed.
No commonly confused words.