adj.鬼鬼祟祟的,诡诈的,贼头贼脑
She was furtive and vicious by temperament.
她本来做事就偷偷摸摸,心肠狠毒。
The teacher was suspicious of the student's furtive behaviour during the exam.
老师怀疑这个学生在考试时有偷偷摸摸的行为.
She cast a furtive glance over her shoulder.
她心里不安,回头偷偷瞥了一下。