covert

1. ADJ Covert activities or situations are secret or hidden. 隱秘的[正式]

They have been supplying covert military aid to the rebels. 他們一直在為叛軍提供隱秘的軍事援助。

2. covertlyADV 隱秘地

They covertly observed Lauren, who was sitting between Ned and Algie at a nearby table. 他們秘密地觀察著鄰近桌子上坐在內(nèi)德和阿爾吉之間的羅倫。