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impeccable (adj) faultless; perfect.
Impeccable language is language free from any fault. Impeccable conduct or manners are perfect conduct or manners. A person's clothes are impeccable if we cannot find fault with them. Anything is impeccable if it has no defect whatever, and is good in every respect.
- Though not a native speaker of English, Juliana's English is impeccable. You cannot show any fault in her grammar or accent, or find any difference between her English and an Englishman's English.
- Lizzy's conduct at the party on her debut was impeccable. She did the right thing at the right time, with not a fault in any of her words or moves. Everyone was impressed by her perfect manners.