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a. 秘密的, 隐密的, 偷偷摸摸的
adj.
偷偷的；鬼鬼祟祟的；狡猾的

The man's furtive manner made the policeman follow him.
这人的鬼鬼祟祟的举止引得警察跟踪了他。
He took a furtive glance at the clock.
他偷偷地瞧了一眼钟。