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He was known for his perfidious actions against his friends.
Describing someone who is deceitful and untrustworthy.
She discovered his perfidious nature after he betrayed her trust.
The perfidious politician made promises he never intended to keep.
Everyone warned her about his perfidious behavior, but she didn't listen.
perfidious friend
perfidious actions
perfidious behavior
treacherous
disloyal
unfaithful