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.
untried
untrodden
untroubled
untrue
untrustworthy
untruth
unturned
untwist
unusable
unused
unusual
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