unrecallable
/(ˌ)ʌnrɪˈkɔːləbl/adjective
That cannot be recalled; (originally) specifically = irrevocable.
Origin
Early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From un- + recall + -able, originally after French irrévocable irrevocable.