expiable

from WordNet (r) 3.0 (2006)

expiable
    adj 1: capable of being atoned for

from The Collaborative International Dictionary of English v.0.48

Expiable \Ex"pi*a*ble\, a. [See {Expiate}.]
   Capable of being expiated or atoned for; as, an expiable
   offense; expiable guilt. --Bp. Hall.
   [1913 Webster]