Perfect, without faults, flaws or errors
He grew up in Norway, but he writes impeccable English.
Incapable of wrongdoing or sin; immaculate
It was easy for James V to imprison Lady Glamis, but actually convicting her was far more difficult; her character was impeccable and she was highly respected by all who knew her.
From Middle French impeccable, from Latin impeccabilis (“not liable to sin”), from im- (“not”) + peccare (“to err, to sin”).
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