surreptitious
🇺🇸
/ˌsɜːrəpˈtɪʃəs/
🇬🇧
/ˌsʌrəpˈtɪʃəs/
adjective
R
done in a hidden way, without wanting to be noticed
He took a surreptitious look around to make sure no one was watching.
他偷偷地四处看了看，以确保没有人在看。
translation
偷偷摸摸