1. without fault or error

- speaks impeccable French

Similar word(s): perfect, faultless, immaculate, incorrupted

2. not capable of sin

Similar word(s): virtuous

Sentences with impeccable as an adjective:

- The only impeccable writers are those who never wrote. - William HazlittHe grew up in Norway, but he writes impeccable English.

- It was easy for James V to imprison Lady Glamis, but actually convicting her was far more difficult; her character was impeccable and she was highly respected by all who knew her.