ADJ-GRADED [usually ADJ n]无戒备的；无防备的；无警惕的 If you describe someone as unwary, you mean that they are not cautious or experienced and are therefore likely to be harmed or deceived. 无戒备的；无防备的；无警惕的 [formal]
With its quicksands the river usually drowns a few unwary visitors every season.
因有流沙，往往每季都会有几个游客不小心在这条河里溺水身亡。
The unwary are people who are unwary.无戒备者；无防备者
Specialist subjects are full of pitfalls for the unwary.