irremissible

 
Pronunciation: /ɪrɪˈmɪsɪb(ə)l/

adjective

  • 1(of a crime) unpardonable.
  • 2(of an obligation or duty) binding.

Origin:

late Middle English: from Old French, or from ecclesiastical Latin irremissibilis, from in- 'not' + remissibilis (from remittere 'remit')