adj.背信弃义的；背叛的；不可靠的；危险的
He is treacherous to his friends. 他对他的朋友不忠。
My memory is treacherous. 我的记忆靠不住。
The road becomes treacherous when it is iced up. 道路结冰以后就很危险了。
adv.背叛地；靠不住地；危险地
n.背叛；奸诈
