Mendacious has a strong negative feeling, suggesting intentional dishonesty, not just a small or harmless lie. Politicians who are often mendacious lose the public's trust quickly.
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Formal Language
'Mendacious' is formal and might not be used in casual conversation; it’s more common in written English or formal speech. The judge referred to the witness's mendacious testimony.
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Cultural Usage
Mendacious may appear in contexts discussing ethics or philosophy, where truth and deception are central themes. In his novel, the mendacious protagonist faces the consequences of his lies.