1620s, from Late Latin impaenitentia, from impaenitens (see impenitent). The older form in English is Impenitency (1560s).
Entries linking to impenitence
impenitent adj.
early 15c., from Latin impaenitentem, from assimilated form of in- "not, opposite of" (see in- (1)) + paenitens (see penitence). As a noun, "hardened sinner," from 1530s.