noun
a statement or belief that is not true
adjective
describing something that is not true or not in accordance with facts
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The statement made by the witness was proven to be untrue during cross-examination.
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I heard a rumor about you, but I know it's untrue.
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Don't believe everything you hear, most of it is just untrue gossip.
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His facade of confidence was quickly revealed to be untrue when he stumbled over his words.