The word that means "to say something that is untrue" is "lie".
You can say "no es verdad".
Something that is untrue
Nothing.
* When you say something you know is untrue or when people don't trust you anymore.
Superstitious is believing in things that are very untrue. Simple as that.
libel
They were not your friend in the first place. Or someone told them untrue things about you, or they are trying to impress other people who might not like you.
Some people say that it can cause arthritis, but this is untrue. Cracking your knuckles can cause your knuckles to grow larger though.
"Untrue" is a kinder and more tactful way to say something is a lie, or that something is demonstrably false. "Although some of his opponents believe President Obama was born in Kenya, that is completely untrue."
true things really happened, and is real when false things r wrong and untrue
Treat everything they say as potentially untrue.