Definition of irreproachable adjective from the Oxford Advanced Learner's Dictionary

 

irreproachable

 adjective
adjective
BrE BrE//ˌɪrɪˈprəʊtʃəbl//
 
; NAmE NAmE//ˌɪrɪˈproʊtʃəbl//
 
 
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(of a person or their behaviour) free from fault and impossible to criticize synonym blameless Word Origin mid 17th cent.: from French irreprochable, from in- ‘not’ + reprochable (from reprocher ‘to reproach’).
See the Oxford Advanced American Dictionary entry: irreproachable