No, faultless is an adjective.
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Without fault; not defective or imperfect; free from blemish; free from incorrectness, vice, or offense; perfect; as, a faultless poem.
beyond criticism; faultless. or blameless or flawless
accurate, right, true, exact, precise, flawless, faultless, fitting, kosher
unbeatable, reliable, trustworthy, helpful, faultless, handy, correct, accurate, dependable