Which adjective describes deceitful and treacherous behavior?

• A. Perfidious
• B. Treacherous
• C. Deceitful
• D. Duplicitous

Answer: (A)

Describing behavior that betrays trust through deceit and treachery. Perfidious refers to faithlessness and the deliberate betrayal of someone who trusted you. Its roots point to breaking faith, signaling a moral failing that goes beyond merely lying or being sneaky. It best combines both deceit and treachery in one word, signaling not just falsehoods but a breach of loyalty. While treacherous touches on danger or betrayal, and deceitful on lying, perfidious emphasizes the intentional betrayal of trust as a serious wrong. Duplicitous highlights double-dealing, but perfidious conveys the deeper sense of faithlessness that underpins true treachery. Example: The perfidious advisor betrayed the king by selling secrets to the enemy.