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comparative more impeccable, superlative most impeccable
Perfect, without faults, flaws or errors quotations examples
The only impeccable writers are those who never wrote.
1821–1822, William Hazlitt, “(please specify the essay name)”, in Table-Talk; or, Original Essays, volumes (please specify |volume=I or II), London: John Warren; Henry Colburn and Co.
Incapable of wrongdoing or sin; immaculate examples