Definition of furtive adjective from the Oxford Advanced Learner's Dictionary

 

furtive

 adjective
adjective
BrE BrE//ˈfɜːtɪv//
 
; NAmE NAmE//ˈfɜːrtɪv//
 
(disapproving)
 
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behaving in a way that shows that you want to keep something secret and do not want to be noticed synonym stealthy She cast a furtive glance over her shoulder. He looked sly and furtive. The look in his eyes became furtive. The secretary looked almost furtive when I walked in. Word Origin early 17th cent.: from French furtif, -ive or Latin furtivus, from furtum ‘theft’.
See the Oxford Advanced American Dictionary entry: furtive