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

 

impeccable

 adjective
adjective
BrE BrE//ɪmˈpekəbl//
 
; NAmE NAmE//ɪmˈpekəbl//
 
 
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without mistakes or faults synonym perfect impeccable manners/taste Her written English is impeccable. He was dressed in a suit and an impeccable white shirt. Word Origin mid 16th cent. (in the theological sense): from Latin impeccabilis, from in- ‘not’ + peccare ‘to sin’.Extra examples Our staff take pride in providing impeccable service. She came to the company with impeccable credentials. impeccable manners/​taste
See the Oxford Advanced American Dictionary entry: impeccable