As adjectives the difference between faultless and unimpeachable
is that faultless is without fault; free from defect or error while unimpeachable is not able to be impeached or reproached.
faultless
English
Adjective
(
en adjective)
Without fault; free from defect or error.
Synonyms
* See also
Antonyms
* faulty
* faultful
* fallible