/ ɪmˈpekəbl; NAmE / adjective
without mistakes or faults
SYN perfect :
impeccable manners / taste
Her written English is impeccable.
He was dressed in a suit and an impeccable white shirt.
► im·pec·cably / -bli; NAmE / adverb :
to behave impeccably
impeccably dressed
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WORD ORIGIN
mid 16th cent. (in the theological sense): from Latin impeccabilis , from in- not + peccare to sin.