secretive
[ˈsikrɪtɪv, sɪˈkritɪv]
adj.
遮遮掩掩的，守口如瓶的，秘密的，偷偷摸摸的;
[生]（促进）分泌的;
嘴紧;
鬼头鬼脑;
例句:
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The Ministry is being obsessively secretive about the issue.
该部对这个问题讳莫如深。
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Having spent a lifetime avidly courting publicity, Paul has suddenly become secretive.
保罗一生都在想方设法出风头，现在却突然行事低调了。
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Katherine was forever secretive.
凯瑟琳总是神神秘秘的。
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Luxembourg is known for its highly secretive banking sector.
来自BBC
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Security arrangements for the meeting were secretive and elaborate.
来自NEWYORKER
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She was secretive about what she was doing.
来自THETIMES