Perfidious
(adjective)
Having a tendency to betray trust or be disloyal, particularly in matters of allegiance or trust.
Origin:
Derived from the latin word 'perfidia' meaning 'faithlessness', perfidious refers to being disloyal or treacherous.
Examples:
- He was branded as a perfidious traitor for betraying his country.
- She felt that his actions were perfidious and that he couldn't be trusted.
- His perfidious behavior caused his friends and family to turn their backs on him.
- She accused him of being perfidious and told him that she never wanted to see him again.
- The perfidious nature of his actions was revealed when he was caught in the act of betrayal.