backroom surreptitious暗中的
surreptitious barefaced暗中的
Surreptitious Unpredictable诡秘莫测
surreptitious menstruation暗经
surreptitious edition翻印版
Surreptitious vomiting偷摸的呕吐
surreptitious advertising属于这种隐藏性的广告
surreptitious entry秘密进入
surreptitious software隐蔽软件;软件加密与解密
ADJ（形容词） A surreptitious action is done secretly. 秘密的 [ADV with v]
He made a surreptitious entrance to the club through the little door in the brick wall.
他从砖墙的小门偷偷进入俱乐部。
ADV（副词） surreptitiously
Surreptitiously Mark looked at his watch.
马克偷偷看了看表。