Which word means 'Willing to betray one's trust'?

• A. Obstinate
• B. Occlude
• C. Perfidious
• D. Obviate

Answer: (C)

This item tests your ability to connect a word to the idea of betraying trust. The best fit for “Willing to betray one's trust” is perfidious. It conveys treachery and faithlessness—someone who would deliberately break confidences or act disloyally. The word comes from Latin perfidus meaning faithless or treacherous, and in English it’s used to describe actions or people marked by betrayal of trust.

Obstinate means stubborn or unyielding, not related to trust or betrayal. Occlude means to block or obstruct. Obviate means to prevent or remove the need for something. Those nuances don’t capture the sense of betrayal as directly as perfidious does.