He looks suspicious.
Tom and Mary gave exactly the same answers on the test which made the teacher suspicious.
If you see a suspicious person, please inform the police.
It was not what he said, but the way he said it that made me suspicious.
True and good friendship must not be suspicious of anything.
The story was too pat and I got rather suspicious.
In her right hand was gripped a suspicious looking rod that practically radiated "I'm a magical girl item".
Leaving your suspicious actions I've seen a mystery - are you trying to rob me of my sleep?
Some of his colleagues at work became suspicious OF his behaviour.
But when Jenny and Juan got married and their doughter Juanita was born the family stopped being suspicious.
It might look suspicious if we arrived together.
Hartley was suspicious that Vivienne loved another man.
I knew she killed that man! She had always looked suspicious to me.
1. He couldn't help being suspicious. / 2. Come back soon, or they'll get suspicious.
If you ask her too directly whether she has a friend, she will become suspicious and answer: "Why did you ask me that?".