na-adjective, noun which may take the genitive case particle 'no'
unrecoverable; irreversible; irreparable
Describes a state that cannot be restored, reversed, or repaired. Often used in technical or formal contexts such as data loss, system failure, or permanent damage.
The data is unrecoverable because the hard disk was physically damaged.
この薬の副作用は稀に回復不能な臓器障害を引き起こすことがある。
This medication's side effects can rarely cause irreversible organ damage.