Faultless, a.
Without fault; not defective or imperfect; free from blemish; free from incorrectness, vice, or offense; perfect; as, a faultless poem. Whoever thinks a faultless piece to see, Thinks what ne'er was, nor is, nor e'er shall be. Pope.
Syn. -- Blameless; spotless; perfect. See Blameless. -- Fault"less*ly, adv.-Fault"less*ness, n.
Shades of meaning
Fernald has no entry of its own for faultless; he lists it under innocent, perfect.
Where he writes about it:
That is perfect to which nothing can be added, and from which nothing can be taken without impairing its excellence, marring its symmetry, or detracting from its worth; in this fullest sense God alone is perfect, but in a limited sense anything may be perfect in its kind; as a perfect flower; a copy of a document is perfect when it is accurate in every particular; a vase may be called perfect when entire and unblemished, even tho not artistically faultless; the best judges never pronounce a work of art perfect, because they see always ideal possibilities not yet attained; even the ideal is not perfect, by reason of the imperfection of the human mind; a human character faultlessly holy would be morally perfect tho finite. — from perfect