Unsurpassed is a related term of faultless.
As adjectives the difference between unsurpassed and faultless
is that unsurpassed is surpassing all others in some way while faultless is without fault; free from defect or error.
unsurpassed
English
Adjective
(-)
surpassing all others in some way
faultless
English
Adjective
(
en adjective)
Without fault; free from defect or error.
Synonyms
* See also
Antonyms
* faulty
* faultful
* fallible