faultless
adjective
- irreproachable (without defect/imperfection/blemish)
Wiktionary
adj
Etymology: Etymology tree English fault Proto-Indo-European *lewh₁- Proto-Indo-European *lewHs-der. Proto-Germanic *leusaną Proto-Germanic *lausaz Proto-Germanic *-lausaz Proto-West Germanic *-laus Old English -lēas Middle English -les English -less English faultless From fault + -less.
- Without fault; free from defect or error.
“faultless effort”
“faultless performance”