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Apr 30, 2024 · If you describe someone as treacherous, you mean that they are likely to betray you and cannot be trusted. [ disapproval ] He publicly left the party and denounced its treacherous leaders.
TREACHEROUS definition: 1. very dangerous, especially because of bad weather conditions: 2. If someone is treacherous…. Learn more.
adj. 1. characterized by faithlessness or readiness to betray trust. 2. deceptive, untrustworthy, or unreliable. 3. unstable or insecure, as footing. 4. dangerous; hazardous: a treacherous climb. treach′er•ous•ly, adv. treach′er•ous•ness, n.