sly [slaɪ]

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adj.狡猾的，偷偷摸摸的

deceiving people in a clever way in order to get what you want

You can't trust him, he's a sly old fox. 你不能相信他，他是一只狡猾的老狐狸。
I was ready to sly out the alley door. 我准备从那边小门溜出去。