covertly

adv.偷偷摸摸地

暗中地，秘密地

副词

1. They were covertly meeting in the park to discuss their plan.
他们秘密地在公园会面，讨论他们的计划。

2. He covertly glanced at his watch, hoping no one would notice.
他偷偷地瞥了一眼手表，希望没人察觉到。