| 词汇 | unfaithful |
| 词根词缀 | 词源： mid-14c., "acting falsely," from un- (1) "not" + faithful (see faith). In M.E. it also had a sense of "infidel, unbelieving, irreligious" (late 14c.). Sense of "not faithful in marriage" is attested from 1828. |
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