sneaky

1. ADJ If you describe someone as sneaky, you disapprove of them because they do things secretly rather than openly. 鬼祟的; 媮媮摸摸的[非正式]

It is a sneaky and underhand way of doing business. 這是一種媮媮摸摸、見(jiàn)不得人的生意經(jīng)。