surreptitious
/ˌsʌrəpˈtɪʃəs/adjective
- kept secret, especially because it would not be approved of私下的; 偷偷摸摸的（尤指因为不会被批准）：
low wages were supplemented by surreptitious payments from tradesmen.
商人私下付的报酬补充了低工资。
派生词
surreptitiously
adverbsurreptitiousness
noun词源
late Middle English （in the sense 'obtained by suppression of the truth'）： from Latin surreptitius （from the verb surripere, from sub- 'secretly' + rapere 'seize'） +-OUS.