faultlessly
  (ad.)完美地,無缺點地
  Fault·less, 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.
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  faultlessly
       adv : without a fault; in a faultless manner; "he solved all the
             problems faultlessly"