相关单词近义词 underground 地下的, furtively 偷偷地, secretly 秘密地, slyly 狡猾的, covertly 偷偷摸摸地, stealthily 暗地里, on the sly 秘密地, secretively 稳秘地, sneakily sneaky的副词形式...临近词surreptitious 返回 surreptitiously