A person who tells blatant and obvious lies.

The benefit received by those spreading fake information as a consequence of the environment in which there is a great deal of fake information and hence it is unclear what is real and what is fake.

Any of various dice games based on bluffing and deception.

plural of liar loan

plural of liar paradox

(philosophy, logic) A paradox involving statements such as "this sentence is false", or "the following statement is true: the previous statement is false", which cannot be meaningfully regarded as either true or false.