covert /ˈkoʊvɚt/ adjective Learner's definition of COVERT
[more covert; most covert]
: made, shown, or done in a way that is not easily seen or noticed : secret or hidden秘密的;隐蔽的;暗中的 -
a covert glance/look偷偷的一瞥/一看
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He has taken part in a number of covert military operations.他参与了许多秘密军事行动。
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spy agencies taking covert action进行秘密活动的情报机构
— opposite overt
— covertness
noun [noncount]