The difference between Faultless and Faulty
When used as adjectives, faultless means without fault, whereas faulty means having or displaying faults.
check bellow for the other definitions of Faultless and Faulty
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Faultless as an adjective:
Without fault; free from defect or error.
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Faulty as an adjective:
Having or displaying faults; not perfect; not adequate or acceptable.
Examples:
"They replaced the faulty wiring and it has worked fine ever since."
"I don't think you can infer that from the premise. It's a faulty argument."
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Faulty as an adjective (obsolete):
At fault, to blame; guilty.