noun
liar
LYE-er/ˈlaɪər/
A person who deliberately says things that are untrue.
The liar blames someone else for the vase she broke.

Etymology
The agent ending identifies someone who practices deception. The Old English noun also meant “false witness,” connecting the word with deliberate falsehood rather than simple error.
In context
When I realised the extent of his lies, I started to Google and the keywords I was Googling were ‘pathological liar’
More examples
- He admitted that he had been a liar about his past.
- The witness called the accusation false and its author a liar.
- Nobody trusted the habitual liar.
Forms
liar · liars
lie verb — Deliberately say something untrue.
Similar words
- deceiver
- Anyone who misleads, including without spoken lies.
- fabricator
- Someone who invents false accounts or evidence.