I have good reason to be suspicious.

我的怀疑有充分理由。

《牛津词典》

She is more likely to be suspicious.

她更容易起疑心。

youdao

It is the nature of regulators to be suspicious.

这种怀疑是监管机构的本能。

youdao

In efforts to repress any revolutionary fervor in the past few years, Iran has deemed large gatherings of people to be suspicious.

VOA: standard.2010.06.15

You can run into issues of things like overflow, underflow, with floating point numbers and when you see a whole bunches of ones, it's particularly a good time to be suspicious.

来看看哪儿会出问题，你可能会碰到浮点数中的溢出和下溢问题,当你碰到一系列这种问题后，可能就会适时的开始怀疑结果的正确性。

麻省理工公开课 - 计算机科学及编程导论课程节选

And security officials are encouraging passengers to be observant and report any suspicious activity.

VOA: standard.2009.12.26

Police consider the disappearance to be suspicious and believe that foul play is involved.

CNN: Honors student leaves doctor's office, disappears

The academics have taught us to be suspicious of the claims of the investment industry.

ECONOMIST: Investment management

An investigation into the cause of the fire has begun but it is not thought to be suspicious.

BBC: Fire tackled at Didcot Power Station