surreptitious

/ˌsɝː.əpˈtɪʃ.əs/

形容词

秘密的，偷偷的；鬼鬼祟祟的
She seemed to be listening to what I was saying, but I couldn't help noticing her surreptitious glances at the clock.
她看起来好像在听我说话，但我明显注意到她偷偷看了几眼钟。