Impeccable
Part of speech: adjective
Definition: Perfect, having no faults, flaws or errors Incapable of wrongdoing or sin; immaculate
Example sentence: Be impeccable with your word.
Immaculate
Part of speech: adjective
Definition: Having no stain or blemish; spotless, undefiled, clear, pure.
Example sentence: The trouble with glossy magazines is that they tend to be stuffed with articles about handbag designers - the sort of women who, with their perfectly styled lives, immaculate houses, and adoring partners, make you want to become a hermit.