in a way that makes you think that something is wrong

He looked at her suspiciously. 他满腹狐疑地看着她。

The children are suspiciously quiet (= are so quiet that they are probably doing something wrong). 孩子们安静得让人觉得奇怪。

His hair is suspiciously black (= looks darker than it should be, and is therefore probably not natural) for a man of his age. 以他这个年纪的人来说，他的头发黑得有些不太自然。

in a way that makes you think someone is guilty of something wrong or illegal

The officers noticed two men acting suspiciously (= as if they were doing something wrong). 警官们注意到有两个人形迹可疑。

in a way that makes you think something may be true

She brushed away what looked suspiciously like (= looked as if it probably was) a tear. 她擦去的好像是一滴眼泪。