1. a person who is disloyal; someone who betrays allegiance or breaks faith with a person, group, or cause
Usage: often used in historical or political contexts; can refer to someone who abandons a cause, organization, or country

Examples

• The general was branded a disloyalist after he refused to support the regime.
• During the revolution, disloyalists were viewed with suspicion by both sides.
• She was accused of being a disloyalist for leaving the party to join a rival organization.
• The disloyalist's actions undermined the unity of the movement.
• History often judges disloyalists harshly, though some are later vindicated.
• He was considered a disloyalist for revealing the company's secrets to competitors.