surreptitious
adjective
UK/ˌsʌr.əpˈtɪʃ.əs/
US/ˌsɝː.əpˈtɪʃ.əs/
Definitions of surreptitious adjective
Done or acting in a secret or stealthy way; avoiding notice or attention.
偷偷摸摸的；暗中
He surreptitiously slipped the candy into his pocket.
他偷偷地把糖果塞进了口袋。
They exchanged a surreptitious glance before giggling.
他们偷偷地交换了一个眼神，然后笑了起来。
The study was conducted under surreptitious conditions.
这项研究是在秘密的条件下进行的。