unwary
adjective uk/ʌnˈweə.ri/ us/ʌnˈwer.i/
不警惕的，不警觉的；不设防的
not conscious of or careful about possible risks and dangers
He sold fake insurance policies to unwary customers. 他向未提防的顾客出售假保险。
A range of tax and technical issues can trip up the unwary (= unwary people). 一系列的税务和技术问题会使粗心大意的人出错。
Synonym: unsuspecting
Opposites: leery suspicious (DOUBT)wary
Compare: gulliblenaive