1. That admits of no atonement or satisfaction.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• inexcuable,
• inexpicable,
• incapiable,
• inexusable,
• inexprable,
• unexpiable,
• inexspiable,
• inexpliable,
• innexpiable,
• inexpiablle,
• inexpieable,
• unexxitable,
• inexcitble,
• inexcittable,
• Inexaitable,
• inexpliably,
• inexpiablyy,
• inexpiably,
• inexpiaye,
• inexpliate

• inexpediently,
• inexpugnable,
• inexpert,
• inexperience,
• inspire,
• inception,
• inspired,
• inhospitable,
• inexplicable,
• inexpungible,
• inexperienced,
• inexpedience,
• inexpediency,
• inseparably,
• inspirer,
• incapable,
• incipient,
• inexpedient,
• inseparable.

The adjective form of the word "inexpiable" is "inexpiable".

The plural form of the word "inexpiable" is "inexpiables".

The singular form of the word "inexpiable" is "inexpiable". This word does not change in form when it is used in either singular or plural contexts.