他对我使了个会意的眼色，暗示他知道这个秘密。

He gave me a ___knowing look, hinting that he was aware of the secret.

她露出一个了然的微笑，好像在暗示她知道我们的秘密。

She gave us a ___knowing smile, as if hinting she knew our secret.

她露出了一个意味深长的微笑，仿佛知道什么秘密。

She gave me a ___knowing smile, as if she held some secret.