- untruth (n.)
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[untruth 词源字典] - Old English untreowþ "unfaithfulness, treachery," from un- (1) "not" + truth (n.). Similar formation in Old Norse utrygð. Meaning "falsehood" is attested from mid-15c., as is that of "a lie." Related: Untruthful.[untruth etymology, untruth origin, 英语词源]