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Impeccable
means something that is flawless or without any faults. Once again, impeccable describes something done to the highest standard, as close to perfect as it can be.
Examples:
1- When Tom Cruise performs his stunts, his focus is impeccable, impressing everyone with how perfectly he completes each one.
2- The hotel staff provided impeccable service during our stay; they anticipated every need and made us feel truly welcomed.