Perjurious is an adjective that describes someone or something that has committed perjury, which is the criminal act of lying under oath or making false statements in a legal proceeding. Synonyms for perjurious include false, deceitful, dishonest, untruthful, mendacious, deceptive, fraudulent, misleading, perfidious, and treacherous. These words can be used interchangeably with perjurious in different contexts but all highlight the negative behavior of someone who lies or misleads others, either intentionally or unintentionally. Using a synonym for perjurious can help add more variety and depth to your writing, especially when describing legal cases or situations where someone is being accused of lying.