Synonyms for Faultless:

adj.

all (adjective)
immaculate, impeccable.
clean (adjective)
Taintless.
having nothing wrong with it (adjective)
flawless, correct, clean, unsullied, spotless, accurate, impeccable, irreproachable, perfect, pure, immaculate, unblemished, stainless, guiltless, blameless, unspotted, innocent, sinless.
innocent (adjective)
uncorrupted, irreproachable, untainted, unblamable.
perfect (adjective)
consummate, complete, ultimate, Taintless, unspoiled, impeccable, irreproachable, perfect, Indefectible, letter-perfect, acme, unflawed, flawless, absolute.
pure (adjective)
monolithic, angelic, bare, essential, basal, fundamental, formative, primal, white, clean, undefiled, nascent, unalloyed, prime, irreducible, unadulterated, elementary, purebred, stainless, virtuous, clear, atomic, aboriginal, plain, blameless, basic, elemental, simple, foundational, uncluttered, untarnished, guiltless, Simon-pure, stark, unsullied, spotless, chaste, primary, honorable, undiluted, unblemished, indivisible, pure, innocent, immaculate, decent, sinless, untainted, austere, unadorned.
unerring (adjective)
unerring.
virtuous (adjective)
heroic, noble, ethical, guiltless, upstanding, moral, honorable, valorous, worthy, decent, estimable, Taintless, unspotted, uncorrupted, blameless, pure, creditable, respectable, virtuous, unsullied, good, high-minded, angelical, righteous, clean.

n.

strict, precise, correct, accurate, unerring, specific, exact, reliable. lily-white, irreproachable, unblamable. unflawed, absolute, Indefectible. faultless (noun)
pure, unblemished, impeccable, blameless, accurate, unsullied, perfect, correct, immaculate, flawless, spotless.

Other synonyms:

Indefectible, unflawed, unblamable. irreproachable, lily-white. Other relevant words:
correct, lily-white, irreproachable, absolute, accurate, strict, Indefectible, unflawed, precise, unerring, unblamable, exact.

Usage examples for faultless

  1. His positions and his encampments were taken with faultless judgment, his skirmishes wisely and coldly kept within the prescribed control, while the inevitable dissolution of the opposing force took place exactly as he had foreseen, and within the limits which he had predicted. – The Rise of the Dutch Republic, Volume II.(of III) 1566-74 by John Lothrop Motley Last Updated: January 25, 2009
  2. By its side was displayed another of velvet; then yet another of very fine dark cloth; perfect in material and make, faultless in its elegance of finish. – Daisy by Elizabeth Wetherell
  3. The recognition of those is a matter of specific training; but, in all those respects, a physician's diagnosis may be faultless and yet he be much mistaken in regard to the true condition of the patient. – Hetty's Strange History by Anonymous