covert

秘密的、暗中的、隐密的

The agency ran a covert operation to track the smugglers.

该情报机构执行了一项秘密行动以追踪走私者。

不明显的、隐含的、含蓄的

She noticed the covert hostility behind his polite smile.

她察觉到他礼貌笑容背后那种隐含的敌意。

掩蔽处、树丛少用

The pheasants scattered into a thick covert beside the field.

野鸡四散躲进田边茂密的树丛里。