furtive

形容词 furtive:

1. marked by quiet and caution and secrecy; taking pains to avoid being observed
   同义词：sneak, sneaky, stealthy, surreptitious
2. secret and sly or sordid
   同义词：backstair, backstairs

1. In a furtive or circumspect manner; indirectly.
   行为鬼祟的或谨慎的; 谨慎的
2. He cast a furtive glance at her.
   他偷偷瞥了她一眼。
3. That person was furtive and did not want to be noticed.
   那人鬼鬼祟祟的并不想让人注意。
4. They are making a furtive movement.
   他们正做一项诡秘的行动。

fur.tive

adj.（形容词）
Characterized by stealth; surreptitious.
秘密的：偷偷摸摸的；鬼鬼祟祟的
Expressive of hidden motives or purposes; shifty.See Synonyms at secret
诡诈的：有不可告人的动机或目的的；耍花招的参见 secret

来源：
French furtif
法语 furtif
from Old French
源自 古法语
from Latin furtovus
源自 拉丁语 furtovus
from furtum [theft]
源自 furtum [偷窃行为]
from fôr [thief] * see bher-
源自 fôr [小偷] *参见 bher-

【引伸】
fur.tively
adv.（副词）
fur.tiveness
n.（名词）