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faultless (adj.)
[faultless 词源字典]
mid-14c., "having no blemishes or imperfections," from
fault
(n.) +
-less
. Meaning "having no blame, culpability, or guilt" is from 1570s. Related:
Faultlessly
;
faultlessness
.
[faultless etymology, faultless origin, 英语词源]