Untruth (noun)

1. A false statement or belief.
2. Something that is not true.
3. A lie or falsehood.

Origin:

Middle english, from un- + truth.

Examples:

1. The politician was caught in an untruth during the debate.
2. The journalist exposed the untruth in the advertisement.
3. The witness's testimony was proven to be an untruth.
4. The child's excuse was revealed to be an untruth.
5. The conspiracy theory was based on multiple untruths.