/ ˌʌnˈtruːθ; NAmE / noun ( pl. un·truths / ˌʌnˈtruːðz; NAmE ; -ˈtruːθs/)
1.
[ C ] ( formal ) a lie. People often say 'untruth' to avoid saying 'lie'.
—compare truth
2.
[ U ] the state of being false
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WORD ORIGIN
Old English untrēowth unfaithfulness (see un- , truth ).