Formal:
* "The witness was caught in a lie, and the judge declared him a liar."
* "The investigation revealed that the defendant was a liar and had fabricated evidence."
Informal:
* "Don't be a liar! I saw you take the cookie!"
* "That's a blatant lie! You're such a liar." (This usage is often used in anger or frustration.)
Figurative:
* "The politician's promises were just empty words, making him a liar in the eyes of the people."
* "The weather report turned out to be a liar, as the sun shone brightly all day."
Important Note:
* Accusing someone of being a liar should be done with caution. It's essential to have strong evidence or a clear reason to believe someone is lying.
* When using "liar" informally, it can be interpreted as rude or aggressive. Consider using alternative words like "untruthful," "deceitful," or "dishonest" to convey the same meaning in a less harsh manner.