s. dangerously unstable and unpredictable
a. 不可信任的, 危险的, 背叛的, 不可靠的
[法] 奸诈的, 背叛的, 背信弃义的
1. The path through the mountains can be treacherous in winter.
冬天穿越山脉的道路可能非常危险。
2. He realized too late that his friend had a treacherous plan.
他太晚才意识到他的朋友有一个阴险的计划。
3. The sea can be treacherous during a storm, so it's best to stay on land.
风暴期间海面可能非常危险，所以最好呆在陆地上。