To indicate something is incorrect or inaccurate:
* "The rumor that the company is closing is untrue."
* "His statement about the weather was untrue; it was actually sunny outside."
* "The information you provided is untrue and misleading."
To express a disagreement or refute a claim:
* "Your claim that the Earth is flat is untrue."
* "The story she told was untrue, and she knew it."
* "He tried to convince me with untrue arguments, but I wasn't fooled."
To describe something that is not genuine or authentic:
* "The diamond ring was untrue, a cheap imitation."
* "Her feelings of love were untrue; she only wanted his money."
* "The painting was untrue to the original, lacking the artist's unique style."
To emphasize the falsity of something:
* "The accusation was completely untrue and without merit."
* "The evidence presented was untrue, and the jury saw through it."
* "It is untrue that the government is planning to raise taxes."
Remember, "untrue" is a strong word that implies a deliberate falsehood. Use it carefully to avoid sounding accusatory or judgmental.