Etymology
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untruth (n.)

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.

updated on April 07, 2014

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Definitions of untruth from WordNet

untruth (n.)
a false statement;
Synonyms: falsehood / falsity
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.