adjective
- not to be expiated; not allowing for expiation or atonement: an inexpiable crime.
- Obsolete. implacable: inexpiable hate.
adjective
- incapable of being expiated; unpardonable
- archaic implacable
1560s, from Latin inexpiabilis “that cannot be atoned for,” from in- “not” (see in- (1)) + expiabilis, from expiare (see expiation).