Guilty of or involving betrayal or deception.; (of ground, water, conditions, etc.) hazardous because of presenting hidden or unpredictable dangers.
‘a treacherous Gestapo agent’
‘memory is particularly treacherous’
‘They are not anywhere near as treacherous as crack addicts or alcoholics for that matter.’
‘The left on Auckland City’s council have become self-indulgent and treacherous to each other.’
‘Gone are interesting characters like the greedy and treacherous aide, and that marvelous biplane.’
‘They are not deceitful or treacherous in their conduct and are faithful to their oaths and promises.’
предательский, коварный, вероломный, ненадежный