His impeccable manners impressed everyone at the dinner.
Synonyms for impeccable
flawless
perfect
spotless
Antonyms for impeccable
flawed
faulty
imperfect
Practice impeccable on real SAT questions
Vocabulary like impeccable appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.