irrecusable

 
Pronunciation: /ˌɪrɪˈkjuːzəb(ə)l/

adjective

rare
  • (of evidence or a statement) not able to be challenged or rejected: I will give him an irrecusable proof

Origin:

late 18th century: via French from late Latin irrecusabilis, from in- 'not' + recusabilis 'that should be refused' (from the verb recusare)