Etymology
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faultless (adj.)

mid-14c., "having no blemishes or imperfections," from fault (n.) + -less. Meaning "having no blame, culpability, or guilt" is from 1570s. Related: Faultlessly; faultlessness.

updated on January 09, 2013

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Definitions of faultless from WordNet

faultless (adj.)
without fault or error;
faultless logic
Synonyms: immaculate / impeccable / incorrupted
From wordnet.princeton.edu, not affiliated with etymonline.