He is a faithful liarThe line above is an example of
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The line "He is a faithful liar" is an example of an oxymoron.
An oxymoron is a figure of speech that combines two contradictory terms to create a new meaning. In this case, "faithful" and "liar" are opposites, as someone who is faithful is typically honest and someone who is a liar is not. However, when combined, the phrase creates a paradoxical meaning, suggesting that the person may be consistent in their dishonesty or loyal to their deceitful ways.
Oxymorons are often used in literature, poetry, and everyday speech to create a rhetorical effect, such as humor, irony, or emphasis.