A person who betrays someone or something, such as a friend, country, or principle.

Someone who is disloyal or betrays a cause or belief.

विश्वासघाती

English Usage: The political party expelled her for being a traitor to their ideals.

Hindi Usage: राजनीतिक पार्टी ने उसे उनके आदर्शों के प्रति विश्वासघाती होने के लिए निकाल दिया।